--- a/dom/media/MediaStreamGraph.cpp
+++ b/dom/media/MediaStreamGraph.cpp
@@ -2412,17 +2412,17 @@ MediaInputPort::Init()
   mDest->AddInput(this);
   // mPortCount decremented via MediaInputPort::Destroy's message
   ++mDest->GraphImpl()->mPortCount;
 }
 
 void
 MediaInputPort::Disconnect()
 {
-  MOZ_ASSERT(GraphImpl()->AssertOnGraphThreadOrNotRunning());
+  GraphImpl()->AssertOnGraphThreadOrNotRunning();
   NS_ASSERTION(!mSource == !mDest,
                "mSource must either both be null or both non-null");
   if (!mSource)
     return;
 
   mSource->RemoveConsumer(this);
   mDest->RemoveInput(this);
   mSource = nullptr;