--- a/xpcom/base/nsISupportsImpl.h
+++ b/xpcom/base/nsISupportsImpl.h
@@ -352,17 +352,17 @@ public:
     // to the thread that destroys the object when it reads mValue with
     // acquire semantics.
     nsrefcnt result = mValue.fetch_sub(1, std::memory_order_release) - 1;
     if (result == 0) {
       // We're going to destroy the object on this thread, so we need
       // acquire semantics to synchronize with the memory released by
       // the last release on other threads, that is, to ensure that
       // writes prior to that release are now visible on this thread.
-      std::atomic_thread_fence(std::memory_order_acquire);
+      result = mValue.load(std::memory_order_acquire);
     }
     return result;
   }
 
   MOZ_ALWAYS_INLINE nsrefcnt operator=(nsrefcnt aValue)
   {
     // Use release semantics since we're not sure what the caller is
     // doing.