--- xnu/xnu-201.5/libkern/c++/OSUnserialize.cpp
+++ xnu/xnu-792.1.5/libkern/c++/OSUnserialize.cpp
@@ -124,7 +124,6 @@
 #ifndef YYSTYPE
 #define YYSTYPE int
 #endif
-#include <stddef.h>
 
 #ifndef __cplusplus
 #ifndef __STDC__
@@ -1566,7 +1565,7 @@
 	OSObject *object;
 
 	if (!lock) {
-		lock = mutex_alloc(ETAP_IO_AHA);
+		lock = mutex_alloc(0);
 		mutex_lock(lock);
 	} else {
 		mutex_lock(lock);