diff --git a/include/jemalloc/internal/jemalloc_internal_inlines_c.h b/include/jemalloc/internal/jemalloc_internal_inlines_c.h
index c54fc992..499ac1b1 100644
--- a/include/jemalloc/internal/jemalloc_internal_inlines_c.h
+++ b/include/jemalloc/internal/jemalloc_internal_inlines_c.h
@@ -45,8 +45,10 @@ iallocztm(tsdn_t *tsdn, size_t size, szind_t ind, bool zero, tcache_t *tcache,
 	assert(size != 0);
 	assert(!is_internal || tcache == NULL);
 	assert(!is_internal || arena == NULL || arena_is_auto(arena));
-	witness_assert_depth_to_rank(tsdn_witness_tsdp_get(tsdn),
-	    WITNESS_RANK_CORE, 0);
+	if (!tsdn_null(tsdn) && tsd_reentrancy_level_get(tsdn_tsd(tsdn)) == 0) {
+		witness_assert_depth_to_rank(tsdn_witness_tsdp_get(tsdn),
+		    WITNESS_RANK_CORE, 0);
+	}
 
 	ret = arena_malloc(tsdn, arena, size, ind, zero, tcache, slow_path);
 	if (config_stats && is_internal && likely(ret != NULL)) {