Index: src/runtime.cc |
diff --git a/src/runtime.cc b/src/runtime.cc |
index 2d760a44359dba24860661f75558d388a178e7dc..c0c87a457d3ad870d701f6747d23a13e644fd741 100644 |
--- a/src/runtime.cc |
+++ b/src/runtime.cc |
@@ -1648,7 +1648,7 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_SetPrototype) { |
ASSERT(args.length() == 2); |
CONVERT_ARG_HANDLE_CHECKED(JSObject, obj, 0); |
CONVERT_ARG_HANDLE_CHECKED(Object, prototype, 1); |
- if (obj->map()->is_observed()) { |
+ if (FLAG_harmony_observation && obj->map()->is_observed()) { |
Handle<Object> old_value( |
GetPrototypeSkipHiddenPrototypes(isolate, *obj), isolate); |