diff --git a/dom/media/MediaFormatReader.cpp b/dom/media/MediaFormatReader.cpp
index 06e8b963bd..773434710e 100644
--- a/dom/media/MediaFormatReader.cpp
+++ b/dom/media/MediaFormatReader.cpp
@@ -32,6 +32,10 @@ using mozilla::layers::Image;
 using mozilla::layers::LayerManager;
 using mozilla::layers::LayersBackend;
 
+// avoid redefined macro warning in unified builds
+#undef LOG
+#undef LOGV
+
 static mozilla::LazyLogModule sFormatDecoderLog("MediaFormatReader");
 mozilla::LazyLogModule gMediaDemuxerLog("MediaDemuxer");