--- a/dom/media/gmp/ChromiumCDMProxy.cpp
+++ b/dom/media/gmp/ChromiumCDMProxy.cpp
@@ -351,17 +351,17 @@ ChromiumCDMProxy::Shutdown()
   mKeys.Clear();
   RefPtr<gmp::ChromiumCDMParent> cdm;
   {
     MutexAutoLock lock(mCDMMutex);
     cdm.swap(mCDM);
   }
   if (cdm) {
     nsCOMPtr<nsIRunnable> task =
-      NewRunnableMethod(mCDM, &gmp::ChromiumCDMParent::Shutdown);
+      NewRunnableMethod(cdm, &gmp::ChromiumCDMParent::Shutdown);
     mGMPThread->Dispatch(task.forget());
   }
 }
 
 void
 ChromiumCDMProxy::RejectPromise(PromiseId aId,
                                 nsresult aCode,
                                 const nsCString& aReason)