--- libmalloc/libmalloc-374.100.5/tests/malloc_zone_unregister_test.c
+++ libmalloc/libmalloc-521.100.59/tests/malloc_zone_unregister_test.c
@@ -11,13 +11,14 @@
 #include <malloc/malloc.h>
 #include <stdlib.h>
 
-T_GLOBAL_META(T_META_RUN_CONCURRENTLY(true));
+T_GLOBAL_META(T_META_RUN_CONCURRENTLY(true), T_META_TAG_XZONE);
 
 extern int32_t malloc_num_zones;
 extern malloc_zone_t **malloc_zones;
 
 T_DECL(malloc_zone_unregister_establish_custom_default_zone,
 		"Unregister all initial zones and register a custom default zone",
+		T_META_ENVVAR("MallocProbGuard=0"),
 		T_META_ENVVAR("MallocNanoZone=1"))
 {
   void *ptr = malloc(7);