--- a/dom/media/systemservices/CamerasChild.cpp
+++ b/dom/media/systemservices/CamerasChild.cpp
@@ -251,18 +251,18 @@ private:
   const char* mRequestingFunc;
   nsIRunnable* mRunnable;
   // Prevent concurrent use of the reply variables by holding
   // the mReplyMonitor. Note that this is unlocked while waiting for
   // the reply to be filled in, necessitating the additional mRequestLock/Mutex;
   MonitorAutoLock mReplyLock;
   MutexAutoLock mRequestLock;
   bool mSuccess;
-  const T mFailureValue;
-  const T mSuccessValue;
+  const T& mFailureValue;
+  const T& mSuccessValue;
 };
 
 bool
 CamerasChild::DispatchToParent(nsIRunnable* aRunnable,
                                MonitorAutoLock& aMonitor)
 {
   CamerasSingleton::Mutex().AssertCurrentThreadOwns();
   CamerasSingleton::Thread()->Dispatch(aRunnable, NS_DISPATCH_NORMAL);