diff --git a/core-foundation-sys/src/array.rs b/core-foundation-sys/src/array.rs
index d85b6dcd0..7944a743a 100644
--- a/core-foundation-sys/src/array.rs
+++ b/core-foundation-sys/src/array.rs
@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use base::{CFRange, CFIndex, CFAllocatorRef, CFTypeID, Boolean, CFComparatorFunction};
 use string::CFStringRef;
diff --git a/core-foundation-sys/src/attributed_string.rs b/core-foundation-sys/src/attributed_string.rs
index 36c0d699d..e1cae20a9 100644
--- a/core-foundation-sys/src/attributed_string.rs
+++ b/core-foundation-sys/src/attributed_string.rs
@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 use base::{CFAllocatorRef, CFTypeRef, CFIndex, CFRange, CFTypeID, Boolean};
 use string::CFStringRef;
 use dictionary::CFDictionaryRef;
diff --git a/core-foundation-sys/src/bag.rs b/core-foundation-sys/src/bag.rs
index 3199f0062..bf42d1b9f 100644
--- a/core-foundation-sys/src/bag.rs
+++ b/core-foundation-sys/src/bag.rs
@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use base::{CFAllocatorRef, Boolean, CFHashCode, CFIndex, CFTypeID};
 use string::CFStringRef;
diff --git a/core-foundation-sys/src/base.rs b/core-foundation-sys/src/base.rs
index 05dfb53c2..5733513e1 100644
--- a/core-foundation-sys/src/base.rs
+++ b/core-foundation-sys/src/base.rs
@@ -7,8 +7,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::cmp::Ordering;
-use std::os::raw::{c_uint, c_void, c_int, c_short, c_uchar, c_ushort};
+use core::cmp::Ordering;
+use core::ffi::{c_uint, c_void, c_int, c_short, c_uchar, c_ushort};
 use string::CFStringRef;
 
 pub type Boolean = u8;
diff --git a/core-foundation-sys/src/binary_heap.rs b/core-foundation-sys/src/binary_heap.rs
index 479ff29a8..44e9c519e 100644
--- a/core-foundation-sys/src/binary_heap.rs
+++ b/core-foundation-sys/src/binary_heap.rs
@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use base::{CFTypeID, CFAllocatorRef, Boolean, CFIndex, CFComparisonResult};
 use string::CFStringRef;
diff --git a/core-foundation-sys/src/bit_vector.rs b/core-foundation-sys/src/bit_vector.rs
index 1c5fc72ce..d8220a7e4 100644
--- a/core-foundation-sys/src/bit_vector.rs
+++ b/core-foundation-sys/src/bit_vector.rs
@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use base::{CFAllocatorRef, Boolean, UInt32, CFIndex, CFTypeID, CFRange, UInt8};
 
diff --git a/core-foundation-sys/src/bundle.rs b/core-foundation-sys/src/bundle.rs
index 792c04858..54c8c4736 100644
--- a/core-foundation-sys/src/bundle.rs
+++ b/core-foundation-sys/src/bundle.rs
@@ -7,10 +7,10 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use base::{CFTypeID, CFAllocatorRef, Boolean, CFTypeRef, UInt32, SInt32};
-use std::os::raw::{c_uint, c_int};
+use core::ffi::{c_uint, c_int};
 use url::CFURLRef;
 use dictionary::CFDictionaryRef;
 use string::CFStringRef;
@@ -27,7 +27,7 @@ pub type CFBundleRefNum = c_int;
 #[allow(unused)]
 #[inline(always)]
 pub unsafe fn CFCopyLocalizedString(key: CFStringRef, comment: CFStringRef) -> CFStringRef {
-    CFBundleCopyLocalizedString(CFBundleGetMainBundle(), key, key, std::ptr::null())
+    CFBundleCopyLocalizedString(CFBundleGetMainBundle(), key, key, core::ptr::null())
 }
 #[allow(unused)]
 #[inline(always)]
diff --git a/core-foundation-sys/src/calendar.rs b/core-foundation-sys/src/calendar.rs
index 175bb0453..2c6fa8213 100644
--- a/core-foundation-sys/src/calendar.rs
+++ b/core-foundation-sys/src/calendar.rs
@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::{c_void, c_char};
+use core::ffi::{c_void, c_char};
 
 use base::{CFAllocatorRef, CFTypeID, Boolean, CFIndex, CFOptionFlags, CFRange};
 use locale::{CFCalendarIdentifier, CFLocaleRef};
diff --git a/core-foundation-sys/src/characterset.rs b/core-foundation-sys/src/characterset.rs
index d3c65e655..92b29872f 100644
--- a/core-foundation-sys/src/characterset.rs
+++ b/core-foundation-sys/src/characterset.rs
@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 use base::{Boolean, CFAllocatorRef, CFIndex, CFRange, CFTypeID, UTF32Char};
 use data::CFDataRef;
 use string::{CFStringRef, UniChar};
diff --git a/core-foundation-sys/src/data.rs b/core-foundation-sys/src/data.rs
index a332e4ef8..9b2e8c5cf 100644
--- a/core-foundation-sys/src/data.rs
+++ b/core-foundation-sys/src/data.rs
@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 use base::{CFAllocatorRef, CFTypeID, CFIndex, CFRange, CFOptionFlags};
 
 #[repr(C)]
diff --git a/core-foundation-sys/src/date.rs b/core-foundation-sys/src/date.rs
index f83ce1dd1..59d759a8c 100644
--- a/core-foundation-sys/src/date.rs
+++ b/core-foundation-sys/src/date.rs
@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use base::{CFAllocatorRef, CFComparisonResult, CFTypeID};
 
diff --git a/core-foundation-sys/src/date_formatter.rs b/core-foundation-sys/src/date_formatter.rs
index f545cfc4e..e0f20f92c 100644
--- a/core-foundation-sys/src/date_formatter.rs
+++ b/core-foundation-sys/src/date_formatter.rs
@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use base::{CFIndex, CFOptionFlags, CFAllocatorRef, CFTypeID, CFTypeRef, CFRange, Boolean};
 use string::CFStringRef;
diff --git a/core-foundation-sys/src/dictionary.rs b/core-foundation-sys/src/dictionary.rs
index 4e6436839..da0203f9c 100644
--- a/core-foundation-sys/src/dictionary.rs
+++ b/core-foundation-sys/src/dictionary.rs
@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use base::{CFAllocatorRef, CFHashCode, CFIndex, CFTypeID, Boolean};
 use string::CFStringRef;
diff --git a/core-foundation-sys/src/error.rs b/core-foundation-sys/src/error.rs
index 3082bf638..51c1a5a0f 100644
--- a/core-foundation-sys/src/error.rs
+++ b/core-foundation-sys/src/error.rs
@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use base::{CFTypeID, CFIndex, CFAllocatorRef};
 use string::CFStringRef;
diff --git a/core-foundation-sys/src/file_security.rs b/core-foundation-sys/src/file_security.rs
index cb51e98ad..e9ee36368 100644
--- a/core-foundation-sys/src/file_security.rs
+++ b/core-foundation-sys/src/file_security.rs
@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use base::{CFAllocatorRef, Boolean, CFTypeID};
 #[cfg(feature="mac_os_10_8_features")]
diff --git a/core-foundation-sys/src/filedescriptor.rs b/core-foundation-sys/src/filedescriptor.rs
index 036d8d58a..62fb41952 100644
--- a/core-foundation-sys/src/filedescriptor.rs
+++ b/core-foundation-sys/src/filedescriptor.rs
@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::{c_int, c_void};
+use core::ffi::{c_int, c_void};
 
 use base::{Boolean, CFIndex, CFTypeID, CFOptionFlags, CFAllocatorRef};
 use string::CFStringRef;
diff --git a/core-foundation-sys/src/lib.rs b/core-foundation-sys/src/lib.rs
index 9f434adba..bdfdf9a85 100644
--- a/core-foundation-sys/src/lib.rs
+++ b/core-foundation-sys/src/lib.rs
@@ -6,6 +6,7 @@
 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
+#![no_std]
 #![allow(non_snake_case, non_camel_case_types, non_upper_case_globals, improper_ctypes)]
 
 #![cfg_attr(all(feature="mac_os_10_7_support", feature="mac_os_10_8_features"), feature(linkage))] // back-compat requires weak linkage
diff --git a/core-foundation-sys/src/locale.rs b/core-foundation-sys/src/locale.rs
index a1fd764d5..4d2edca3d 100644
--- a/core-foundation-sys/src/locale.rs
+++ b/core-foundation-sys/src/locale.rs
@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 use base::{CFIndex, CFAllocatorRef, CFTypeRef, LangCode, RegionCode, CFTypeID};
 use array::CFArrayRef;
 use string::CFStringRef;
diff --git a/core-foundation-sys/src/mach_port.rs b/core-foundation-sys/src/mach_port.rs
index a25a44c12..19a998924 100644
--- a/core-foundation-sys/src/mach_port.rs
+++ b/core-foundation-sys/src/mach_port.rs
@@ -10,7 +10,7 @@
 use base::{CFAllocatorRef, CFIndex, CFTypeID, Boolean, mach_port_t};
 use string::CFStringRef;
 use runloop::CFRunLoopSourceRef;
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 #[repr(C)]
 pub struct __CFMachPort(c_void);
diff --git a/core-foundation-sys/src/messageport.rs b/core-foundation-sys/src/messageport.rs
index 263f0c52b..2e0ec710a 100644
--- a/core-foundation-sys/src/messageport.rs
+++ b/core-foundation-sys/src/messageport.rs
@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use base::{CFAllocatorRef, CFIndex, CFTypeID, Boolean, SInt32};
 use data::CFDataRef;
diff --git a/core-foundation-sys/src/notification_center.rs b/core-foundation-sys/src/notification_center.rs
index 002c1fe27..e2a6b058a 100644
--- a/core-foundation-sys/src/notification_center.rs
+++ b/core-foundation-sys/src/notification_center.rs
@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use base::{CFOptionFlags, CFIndex, CFTypeID, Boolean};
 use dictionary::CFDictionaryRef;
diff --git a/core-foundation-sys/src/number.rs b/core-foundation-sys/src/number.rs
index a355baaed..5c65320bb 100644
--- a/core-foundation-sys/src/number.rs
+++ b/core-foundation-sys/src/number.rs
@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use base::{CFAllocatorRef, CFTypeID, CFComparisonResult, Boolean, CFIndex};
 
diff --git a/core-foundation-sys/src/number_formatter.rs b/core-foundation-sys/src/number_formatter.rs
index 8960c61fa..da320c72c 100644
--- a/core-foundation-sys/src/number_formatter.rs
+++ b/core-foundation-sys/src/number_formatter.rs
@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::{c_void, c_double};
+use core::ffi::{c_void, c_double};
 
 use base::{CFIndex, CFOptionFlags, CFAllocatorRef, CFTypeID, CFRange, Boolean, CFTypeRef};
 use string::CFStringRef;
diff --git a/core-foundation-sys/src/plugin.rs b/core-foundation-sys/src/plugin.rs
index f5f133f4d..df47eca52 100644
--- a/core-foundation-sys/src/plugin.rs
+++ b/core-foundation-sys/src/plugin.rs
@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use base::{CFAllocatorRef, CFTypeID, Boolean, CFIndex};
 use bundle::{CFPlugInRef, CFBundleRef};
diff --git a/core-foundation-sys/src/runloop.rs b/core-foundation-sys/src/runloop.rs
index 062b93cb1..342a2a6af 100644
--- a/core-foundation-sys/src/runloop.rs
+++ b/core-foundation-sys/src/runloop.rs
@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use array::CFArrayRef;
 use base::{Boolean, CFIndex, CFTypeID, CFAllocatorRef, CFOptionFlags, CFHashCode, mach_port_t};
diff --git a/core-foundation-sys/src/set.rs b/core-foundation-sys/src/set.rs
index 57440e352..f7167ec3b 100644
--- a/core-foundation-sys/src/set.rs
+++ b/core-foundation-sys/src/set.rs
@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use base::{CFAllocatorRef, CFIndex, CFTypeID, Boolean, CFHashCode};
 use string::CFStringRef;
diff --git a/core-foundation-sys/src/socket.rs b/core-foundation-sys/src/socket.rs
index a3d81c455..afade4cfb 100644
--- a/core-foundation-sys/src/socket.rs
+++ b/core-foundation-sys/src/socket.rs
@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use base::{CFIndex, CFOptionFlags, SInt32, CFTypeID, CFAllocatorRef, UInt16, Boolean};
 use data::CFDataRef;
@@ -25,9 +25,9 @@ pub type CFSocketError = CFIndex;
 pub type CFSocketCallBackType = CFOptionFlags;
 pub type CFSocketCallBack = extern "C" fn (s: CFSocketRef, _type: CFSocketCallBackType, address: CFDataRef, cdata: *const c_void, info: *mut c_void);
 #[cfg(not(target_os = "windows"))]
-pub type CFSocketNativeHandle = std::os::raw::c_int;
+pub type CFSocketNativeHandle = core::ffi::c_int;
 #[cfg(target_os = "windows")]
-pub type CFSocketNativeHandle = std::os::raw::c_ulong;
+pub type CFSocketNativeHandle = core::ffi::c_ulong;
 
 pub const kCFSocketSuccess: CFSocketError = 0;
 pub const kCFSocketError: CFSocketError = -1;
diff --git a/core-foundation-sys/src/stream.rs b/core-foundation-sys/src/stream.rs
index 26816e16a..117d8f9a0 100644
--- a/core-foundation-sys/src/stream.rs
+++ b/core-foundation-sys/src/stream.rs
@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::{c_void, c_int};
+use core::ffi::{c_void, c_int};
 
 use base::{CFIndex, CFOptionFlags, SInt32, CFTypeID, CFAllocatorRef, UInt8, Boolean, CFTypeRef, UInt32};
 use string::CFStringRef;
diff --git a/core-foundation-sys/src/string.rs b/core-foundation-sys/src/string.rs
index 46a94bee5..0baf89fb5 100644
--- a/core-foundation-sys/src/string.rs
+++ b/core-foundation-sys/src/string.rs
@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::{c_char, c_void, c_ulong, c_double, c_ushort};
+use core::ffi::{c_char, c_void, c_ulong, c_double, c_ushort};
 use base::{Boolean, CFOptionFlags, CFIndex, CFAllocatorRef, ConstStr255Param, CFRange, CFTypeID, SInt32, UInt32, UInt8, CFComparisonResult, StringPtr, ConstStringPtr, UTF32Char};
 use array::CFArrayRef;
 use data::CFDataRef;
diff --git a/core-foundation-sys/src/string_tokenizer.rs b/core-foundation-sys/src/string_tokenizer.rs
index f4c23d4a4..1318d38a6 100644
--- a/core-foundation-sys/src/string_tokenizer.rs
+++ b/core-foundation-sys/src/string_tokenizer.rs
@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use base::{CFAllocatorRef, CFTypeID, CFRange, CFIndex, CFOptionFlags, CFTypeRef};
 use string::CFStringRef;
diff --git a/core-foundation-sys/src/timezone.rs b/core-foundation-sys/src/timezone.rs
index 91e7ed0b1..cfdf4b28e 100644
--- a/core-foundation-sys/src/timezone.rs
+++ b/core-foundation-sys/src/timezone.rs
@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use base::{CFAllocatorRef, CFTypeID, Boolean, CFIndex};
 use date::{CFTimeInterval, CFAbsoluteTime};
diff --git a/core-foundation-sys/src/tree.rs b/core-foundation-sys/src/tree.rs
index ddc5fdf74..20f1278a6 100644
--- a/core-foundation-sys/src/tree.rs
+++ b/core-foundation-sys/src/tree.rs
@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use base::{CFIndex, CFTypeID, CFAllocatorRef, CFComparatorFunction};
 use string::CFStringRef;
diff --git a/core-foundation-sys/src/url.rs b/core-foundation-sys/src/url.rs
index 75235fcb6..2f1eb10a3 100644
--- a/core-foundation-sys/src/url.rs
+++ b/core-foundation-sys/src/url.rs
@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use base::{CFOptionFlags, CFIndex, CFAllocatorRef, Boolean, CFTypeID, CFTypeRef, SInt32, CFRange};
 use data::CFDataRef;
diff --git a/core-foundation-sys/src/url_enumerator.rs b/core-foundation-sys/src/url_enumerator.rs
index 553426625..e347c6a86 100644
--- a/core-foundation-sys/src/url_enumerator.rs
+++ b/core-foundation-sys/src/url_enumerator.rs
@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use base::{CFOptionFlags, CFIndex, CFTypeID, CFAllocatorRef, Boolean};
 use url::CFURLRef;
diff --git a/core-foundation-sys/src/user_notification.rs b/core-foundation-sys/src/user_notification.rs
index 0e01856bb..7799ffd49 100644
--- a/core-foundation-sys/src/user_notification.rs
+++ b/core-foundation-sys/src/user_notification.rs
@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use base::{CFOptionFlags, CFIndex, CFAllocatorRef, CFTypeID, SInt32};
 use dictionary::CFDictionaryRef;
diff --git a/core-foundation-sys/src/uuid.rs b/core-foundation-sys/src/uuid.rs
index d04c711d2..dce340a83 100644
--- a/core-foundation-sys/src/uuid.rs
+++ b/core-foundation-sys/src/uuid.rs
@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use base::{CFAllocatorRef, CFTypeID};
 use string::CFStringRef;
diff --git a/core-foundation-sys/src/xml_node.rs b/core-foundation-sys/src/xml_node.rs
index 7626d3959..2c8cc6921 100644
--- a/core-foundation-sys/src/xml_node.rs
+++ b/core-foundation-sys/src/xml_node.rs
@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::{c_void, c_char};
+use core::ffi::{c_void, c_char};
 
 use base::{Boolean, CFIndex, CFAllocatorRef, CFTypeID};
 use tree::CFTreeRef;
diff --git a/core-foundation-sys/src/xml_parser.rs b/core-foundation-sys/src/xml_parser.rs
index 091d624cd..9ff9d6b9b 100644
--- a/core-foundation-sys/src/xml_parser.rs
+++ b/core-foundation-sys/src/xml_parser.rs
@@ -7,7 +7,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::os::raw::c_void;
+use core::ffi::c_void;
 
 use base::{CFOptionFlags, CFIndex, Boolean, CFAllocatorRef, CFTypeID};
 use xml_node::{CFXMLNodeRef, CFXMLTreeRef, CFXMLExternalID};