diff --git a/src/unix/linux_like/android/b64/aarch64/mod.rs b/src/unix/linux_like/android/b64/aarch64/mod.rs
index 3c6131089ee89..1b439c60827bc 100644
--- a/src/unix/linux_like/android/b64/aarch64/mod.rs
+++ b/src/unix/linux_like/android/b64/aarch64/mod.rs
@@ -74,7 +74,8 @@ s! {
         pub sp: c_ulonglong,
         pub pc: c_ulonglong,
         pub pstate: c_ulonglong,
-        __reserved: [u64; 512],
+        _padding: u64,
+        pub __reserved: [u8; 4096],
     }
 
     pub struct user_fpsimd_struct {
diff --git a/src/unix/linux_like/linux/gnu/b64/aarch64/mod.rs b/src/unix/linux_like/linux/gnu/b64/aarch64/mod.rs
index b5af0e8ec9548..5daa9fc942951 100644
--- a/src/unix/linux_like/linux/gnu/b64/aarch64/mod.rs
+++ b/src/unix/linux_like/linux/gnu/b64/aarch64/mod.rs
@@ -219,7 +219,8 @@ s! {
         pub sp: c_ulonglong,
         pub pc: c_ulonglong,
         pub pstate: c_ulonglong,
-        __reserved: [u64; 512],
+        _padding: u64,
+        pub __reserved: [u8; 4096],
     }
 
     pub struct user_fpsimd_struct {
diff --git a/src/unix/linux_like/linux/musl/b64/aarch64/mod.rs b/src/unix/linux_like/linux/musl/b64/aarch64/mod.rs
index 087e39001e84f..7da06fa8241d5 100644
--- a/src/unix/linux_like/linux/musl/b64/aarch64/mod.rs
+++ b/src/unix/linux_like/linux/musl/b64/aarch64/mod.rs
@@ -103,7 +103,8 @@ s! {
         pub sp: c_ulong,
         pub pc: c_ulong,
         pub pstate: c_ulong,
-        __reserved: [u64; 512],
+        _padding: u64,
+        pub __reserved: [u8; 4096],
     }
 
     #[repr(align(8))]