--- xnu/xnu-792.6.22/libkern/c++/OSUnserialize.cpp
+++ xnu/xnu-201.19/libkern/c++/OSUnserialize.cpp
@@ -124,6 +124,7 @@
 #ifndef YYSTYPE
 #define YYSTYPE int
 #endif
+#include <stddef.h>
 
 #ifndef __cplusplus
 #ifndef __STDC__
@@ -1565,7 +1566,7 @@
 	OSObject *object;
 
 	if (!lock) {
-		lock = mutex_alloc(0);
+		lock = mutex_alloc(ETAP_IO_AHA);
 		mutex_lock(lock);
 	} else {
 		mutex_lock(lock);