--- a/dom/media/ipc/VideoDecoderChild.cpp
+++ b/dom/media/ipc/VideoDecoderChild.cpp
@@ -16,16 +16,17 @@ namespace dom {
 
 using base::Thread;
 using namespace ipc;
 using namespace layers;
 using namespace gfx;
 
 VideoDecoderChild::VideoDecoderChild()
   : mThread(VideoDecoderManagerChild::GetManagerThread())
+  , mLayersBackend(layers::LayersBackend::LAYERS_NONE)
   , mCanSend(true)
 {
 }
 
 VideoDecoderChild::~VideoDecoderChild()
 {
   AssertOnManagerThread();
   mInitPromise.RejectIfExists(NS_ERROR_DOM_MEDIA_CANCELED, __func__);