--- libmalloc/libmalloc-317.121.1/tests/basic_malloc_free_perf.c
+++ libmalloc/libmalloc-166.251.2/tests/basic_malloc_free_perf.c
@@ -542,7 +542,7 @@
 	   "Malloc/Free by size class with offset parallel",
 	   T_META_TAG_PERF, T_META_ALL_VALID_ARCHS(NO),
 	   T_META_LTEPHASE(LTE_POSTINIT),
-	   T_META_ENVVAR("MallocNanoZone=0"))
+	   T_META_ENVVAR("MallocNanoZone"))
 {
 	basic_perf_malloc_free_by_size_class_offset(false);
 }