| Index: src/builtins.cc | 
| diff --git a/src/builtins.cc b/src/builtins.cc | 
| index c0a0ef7fe2ac792e16ee99dd71607a46a5fccba9..465d7307c15721962083721acc2812069fce95b4 100644 | 
| --- a/src/builtins.cc | 
| +++ b/src/builtins.cc | 
| @@ -208,7 +208,7 @@ inline bool GetSloppyArgumentsLength(Isolate* isolate, Handle<JSObject> object, | 
| Map* arguments_map = isolate->native_context()->sloppy_arguments_map(); | 
| if (object->map() != arguments_map) return false; | 
| DCHECK(object->HasFastElements()); | 
| -  Object* len_obj = object->InObjectPropertyAt(Heap::kArgumentsLengthIndex); | 
| +  Object* len_obj = object->InObjectPropertyAt(JSArgumentsObject::kLengthIndex); | 
| if (!len_obj->IsSmi()) return false; | 
| *out = Max(0, Smi::cast(len_obj)->value()); | 
| return *out <= object->elements()->length(); | 
|  |