diff --git a/core-foundation-sys/src/base.rs b/core-foundation-sys/src/base.rs
index 05dfb53c2..631c7bf4b 100644
--- a/core-foundation-sys/src/base.rs
+++ b/core-foundation-sys/src/base.rs
@@ -169,5 +169,6 @@ extern {
     pub fn CFShow(obj: CFTypeRef);
 
     /* Base Utilities Reference */
+    pub fn CFRangeMake(loc: CFIndex, len: CFIndex) -> CFRange;
     // N.B. Some things missing here.
 }