diff --git a/src/unix/bsd/apple/mod.rs b/src/unix/bsd/apple/mod.rs
index ead06daa36695..9c13cca9ddad6 100644
--- a/src/unix/bsd/apple/mod.rs
+++ b/src/unix/bsd/apple/mod.rs
@@ -5789,6 +5789,8 @@ extern "C" {
         attrBufSize: ::size_t,
         options: u64,
     ) -> ::c_int;
+
+    pub fn malloc_size(ptr: *const ::c_void) -> ::size_t;
 }
 
 pub unsafe fn mach_task_self() -> ::mach_port_t {
diff --git a/src/unix/bsd/mod.rs b/src/unix/bsd/mod.rs
index 20e203bde37b0..204e87a61c107 100644
--- a/src/unix/bsd/mod.rs
+++ b/src/unix/bsd/mod.rs
@@ -884,6 +884,7 @@ extern "C" {
     pub fn srand48(seed: ::c_long);
     pub fn seed48(xseed: *mut ::c_ushort) -> *mut ::c_ushort;
     pub fn lcong48(p: *mut ::c_ushort);
+
 }
 
 cfg_if! {