--- a/dom/media/systemservices/MediaParent.h
+++ b/dom/media/systemservices/MediaParent.h
@@ -35,26 +35,37 @@ protected:
                                                          const bool& aOnlyPrivateBrowsing) = 0;
   virtual void
   ActorDestroy(ActorDestroyReason aWhy) = 0;
 
   bool SendGetPrincipalKeyResponse(const uint32_t& aRequestId,
                                    nsCString aKey);
 };
 
+/**
+ * Dummy class to avoid a templated class being passed to the refcounting macro
+ * (see Bug 1334421 for what happens then)
+ */
+class RefCountedParent
+{
+public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(RefCountedParent)
+
+protected:
+  virtual ~RefCountedParent() {}
+};
+
 // Super = PMediaParent or NonE10s
 
 template<class Super>
-class Parent : public Super
+class Parent : public RefCountedParent, public Super
 {
   typedef mozilla::ipc::IProtocol::ActorDestroyReason
       ActorDestroyReason;
 public:
-  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(Parent<Super>)
-
   virtual mozilla::ipc::IPCResult
   RecvGetPrincipalKey(const uint32_t& aRequestId,
                       const mozilla::ipc::PrincipalInfo& aPrincipalInfo,
                       const bool& aPersist) override;
   virtual mozilla::ipc::IPCResult RecvSanitizeOriginKeys(const uint64_t& aSinceWhen,
                                                          const bool& aOnlyPrivateBrowsing) override;
   virtual void ActorDestroy(ActorDestroyReason aWhy) override;