--- libmalloc/libmalloc-646.0.13/tests/malloc_zone_unregister_test.c
+++ libmalloc/libmalloc-425.100.7/tests/malloc_zone_unregister_test.c
@@ -7,29 +7,18 @@
 
 #include <darwintest.h>
 
-#include <mach/mach.h>  // mach_task_self()
 #include <malloc_private.h>
 #include <malloc/malloc.h>
 #include <stdlib.h>
 
-T_GLOBAL_META(T_META_RUN_CONCURRENTLY(true), T_META_TAG_XZONE);
+T_GLOBAL_META(T_META_RUN_CONCURRENTLY(true));
 
 extern int32_t malloc_num_zones;
 extern malloc_zone_t **malloc_zones;
 
-static malloc_zone_t *
-get_wrapped_zone(malloc_zone_t *zone)
-{
-  malloc_zone_t *wrapped_zone;
-  kern_return_t kr = malloc_get_wrapped_zone(mach_task_self(),
-      /*memory_reader=*/NULL, (vm_address_t)zone, (vm_address_t *)&wrapped_zone);
-  T_QUIET; T_ASSERT_EQ(kr, KERN_SUCCESS, "malloc_get_wrapped_zone() failed");
-  return wrapped_zone;
-}
-
 T_DECL(malloc_zone_unregister_establish_custom_default_zone,
 		"Unregister all initial zones and register a custom default zone",
-		T_META_ENVVAR("MallocNanoZone=1"), T_META_TAG_VM_NOT_PREFERRED)
+		T_META_ENVVAR("MallocNanoZone=1"))
 {
   void *ptr = malloc(7);
   T_EXPECT_NOTNULL(malloc_zone_from_ptr(ptr), "can find zone for allocation");
@@ -48,19 +37,20 @@
 
   // No zones, no results, no crash
   T_EXPECT_NULL(malloc_zone_from_ptr(ptr), "cannot find zone");
+  T_EXPECT_FALSE(malloc_claimed_address(ptr), "ptr not claimed");
 
   // Create and register custom default zone
   malloc_zone_t *custom_zone = malloc_create_zone(0, 0);
 
   // Custom default zone only, no results, no crash
   T_EXPECT_NULL(malloc_zone_from_ptr(ptr), "cannot find zone");
+  T_EXPECT_FALSE(malloc_claimed_address(ptr), "ptr not claimed");
 
   // Re-register initial zones
   for (uint32_t i = 0; i < initial_zone_count; i++) {
     malloc_zone_register(initial_zones[i]);
   }
-  uint32_t additional_zone_count = get_wrapped_zone(custom_zone) ? 2 : 1;
-  T_EXPECT_EQ(malloc_num_zones, initial_zone_count + additional_zone_count, "re-registered initial zones");
+  T_EXPECT_EQ(malloc_num_zones, initial_zone_count + 1, "re-registered initial zones");
 
   // Custom default zone plus initial zones
   T_EXPECT_NOTNULL(malloc_zone_from_ptr(ptr), "can find zone for allocation");