--- a/js/public/Utility.h
+++ b/js/public/Utility.h
@@ -842,17 +842,17 @@ namespace js {
  */
 template<typename T>
 class MoveRef {
   public:
     typedef T Referent;
     explicit MoveRef(T &t) : pointer(&t) { }
     T &operator*()  const { return *pointer; }
     T *operator->() const { return  pointer; }
-#ifdef __GXX_EXPERIMENTAL_CXX0X__
+#if defined(__GXX_EXPERIMENTAL_CXX0X__) && defined(__clang__)
     /*
      * If MoveRef is used in a rvalue position (which is expected), we can
      * end up in a situation where, without this ifdef, we would try to pass
      * a T& to a move constructor, which fails. It is not clear if the compiler
      * should instead use the copy constructor, but for now this lets us build
      * with clang. See bug 689066 and llvm.org/pr11003 for the details.
      * Note: We can probably remove MoveRef completely once we are comfortable
      * using c++11.