diff --git a/deps/v8/src/builtins/builtins-object.cc b/deps/v8/src/builtins/builtins-object.cc
index 671397d9eacd11..53de00338ae4db 100644
--- a/deps/v8/src/builtins/builtins-object.cc
+++ b/deps/v8/src/builtins/builtins-object.cc
@@ -300,10 +300,10 @@ void Builtins::Generate_ObjectProtoToString(CodeStubAssembler* assembler) {
   Node* context = assembler->Parameter(3);
 
   assembler->GotoIf(
-      assembler->Word32Equal(receiver, assembler->UndefinedConstant()),
+      assembler->WordEqual(receiver, assembler->UndefinedConstant()),
       &return_undefined);
 
-  assembler->GotoIf(assembler->Word32Equal(receiver, assembler->NullConstant()),
+  assembler->GotoIf(assembler->WordEqual(receiver, assembler->NullConstant()),
                     &return_null);
 
   assembler->GotoIf(assembler->WordIsSmi(receiver), &return_number);
diff --git a/deps/v8/test/mjsunit/regress/regress-crbug-664506.js b/deps/v8/test/mjsunit/regress/regress-crbug-664506.js
new file mode 100644
index 00000000000000..b0bf5e7591d4f4
--- /dev/null
+++ b/deps/v8/test/mjsunit/regress/regress-crbug-664506.js
@@ -0,0 +1,11 @@
+// Copyright 2016 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --expose-gc --predictable --random-seed=-1109634722
+
+gc();
+gc();
+assertEquals("[object Object]", Object.prototype.toString.call({}));
+gc();
+assertEquals("[object Array]", Object.prototype.toString.call([]));