--- xnu/xnu-123.5/libkern/c++/OSUnserialize.cpp
+++ xnu/xnu-344.2/libkern/c++/OSUnserialize.cpp
@@ -124,7 +124,6 @@
 #ifndef YYSTYPE
 #define YYSTYPE int
 #endif
-#include <stddef.h>
 
 #ifndef __cplusplus
 #ifndef __STDC__
@@ -1567,9 +1566,9 @@
 
 	if (!lock) {
 		lock = mutex_alloc(ETAP_IO_AHA);
-		_mutex_lock(lock);
+		mutex_lock(lock);
 	} else {
-		_mutex_lock(lock);
+		mutex_lock(lock);
 
 	}