diff --git a/dom/media/MediaFormatReader.cpp b/dom/media/MediaFormatReader.cpp
index 1d4abfb69f8e..5c9be8422e3e 100644
--- a/dom/media/MediaFormatReader.cpp
+++ b/dom/media/MediaFormatReader.cpp
@@ -1113,7 +1113,7 @@ MediaFormatReader::Shutdown()
     mAudio.mTrackDemuxer->BreakCycles();
     mAudio.mTrackDemuxer = nullptr;
     mAudio.ResetState();
-    mShutdownPromisePool->Track(ShutdownDecoderWithPromise(TrackInfo::kAudioTrack));
+    ShutdownDecoderWithPromise(TrackInfo::kAudioTrack);
   }
 
   if (HasVideo()) {
@@ -1121,7 +1121,7 @@ MediaFormatReader::Shutdown()
     mVideo.mTrackDemuxer->BreakCycles();
     mVideo.mTrackDemuxer = nullptr;
     mVideo.ResetState();
-    mShutdownPromisePool->Track(ShutdownDecoderWithPromise(TrackInfo::kVideoTrack));
+    ShutdownDecoderWithPromise(TrackInfo::kVideoTrack);
   }
 
   mShutdownPromisePool->Track(mDemuxer->Shutdown());
@@ -1137,7 +1137,7 @@ MediaFormatReader::Shutdown()
            &MediaFormatReader::TearDownDecoders);
 }
 
-RefPtr<ShutdownPromise>
+void
 MediaFormatReader::ShutdownDecoderWithPromise(TrackType aTrack)
 {
   LOGV("%s", TrackTypeToStr(aTrack));
@@ -1148,13 +1148,15 @@ MediaFormatReader::ShutdownDecoderWithPromise(TrackType aTrack)
     // We always flush the decoder prior to a shutdown to ensure that all the
     // potentially pending operations on the decoder are completed.
     decoder.Flush();
-    return decoder.mShutdownPromise.Ensure(__func__);
+    mShutdownPromisePool->Track(decoder.mShutdownPromise.Ensure(__func__));
+    return;
   }
 
   if (decoder.mFlushing || decoder.mShuttingDown) {
     // Let the current flush or shutdown operation complete, Flush will continue
     // shutting down the current decoder now that the shutdown promise is set.
-    return decoder.mShutdownPromise.Ensure(__func__);
+    mShutdownPromisePool->Track(decoder.mShutdownPromise.Ensure(__func__));
+    return;
   }
 
   if (!decoder.mDecoder) {
@@ -1163,12 +1165,12 @@ MediaFormatReader::ShutdownDecoderWithPromise(TrackType aTrack)
     // This will be a no-op until we're processing the final decoder shutdown
     // prior to the MediaFormatReader being shutdown.
     mDecoderFactory->ShutdownDecoder(aTrack);
-    return ShutdownPromise::CreateAndResolve(true, __func__);
+    return;
   }
 
   // Finally, let's just shut down the currently active decoder.
   decoder.ShutdownDecoder();
-  return decoder.mShutdownPromise.Ensure(__func__);
+  mShutdownPromisePool->Track(decoder.mShutdownPromise.Ensure(__func__));
 }
 
 void
@@ -1184,7 +1186,7 @@ MediaFormatReader::ShutdownDecoder(TrackType aTrack)
     LOGV("Shutdown already in progress");
     return;
   }
-  Unused << ShutdownDecoderWithPromise(aTrack);
+  ShutdownDecoderWithPromise(aTrack);
 }
 
 RefPtr<ShutdownPromise>
diff --git a/dom/media/MediaFormatReader.h b/dom/media/MediaFormatReader.h
index 6119d5bf7624..30af56ae9283 100644
--- a/dom/media/MediaFormatReader.h
+++ b/dom/media/MediaFormatReader.h
@@ -549,7 +549,7 @@ private:
   bool mHasStartTime = false;
 
   void ShutdownDecoder(TrackType aTrack);
-  RefPtr<ShutdownPromise> ShutdownDecoderWithPromise(TrackType aTrack);
+  void ShutdownDecoderWithPromise(TrackType aTrack);
   RefPtr<ShutdownPromise> TearDownDecoders();
 };