diff --git a/content/media/AudioSink.cpp b/content/media/AudioSink.cpp
index b70554ac804c..67f6332fe2f0 100644
--- a/content/media/AudioSink.cpp
+++ b/content/media/AudioSink.cpp
@@ -195,6 +195,7 @@ AudioSink::InitializeAudioStream()
 void
 AudioSink::Drain()
 {
+  MOZ_ASSERT(!mAudioStream->IsPaused());
   AssertCurrentThreadInMonitor();
   // If the media was too short to trigger the start of the audio stream,
   // start it now.