diff --git a/chromium/v8/src/objects/map-updater.cc b/chromium/v8/src/objects/map-updater.cc
index 2ebfc84d3e3..489a2a613d0 100644
--- a/chromium/v8/src/objects/map-updater.cc
+++ b/chromium/v8/src/objects/map-updater.cc
@@ -1031,14 +1031,21 @@ MapUpdater::State MapUpdater::ConstructNewMap() {
   Handle<Map> new_map =
       Map::AddMissingTransitions(isolate_, split_map, new_descriptors);
 
+  bool had_any_enum_cache =
+      split_map->instance_descriptors(isolate_)
+              .enum_cache()
+              .keys()
+              .length() > 0 ||
+      old_descriptors_->enum_cache().keys().length() > 0;
+
   // Deprecated part of the transition tree is no longer reachable, so replace
   // current instance descriptors in the "survived" part of the tree with
   // the new descriptors to maintain descriptors sharing invariant.
   split_map->ReplaceDescriptors(isolate_, *new_descriptors);
 
-  // If the old descriptors had an enum cache, make sure the new ones do too.
-  if (old_descriptors_->enum_cache().keys().length() > 0 &&
-      new_map->NumberOfEnumerableProperties() > 0) {
+  // If the old descriptors had an enum cache (or if {split_map}'s descriptors
+  // had one), make sure the new ones do too.
+  if (had_any_enum_cache && new_map->NumberOfEnumerableProperties() > 0) {
     FastKeyAccumulator::InitializeFastPropertyEnumCache(
         isolate_, new_map, new_map->NumberOfEnumerableProperties());
   }