--- a/gfx/layers/basic/BasicImages.cpp
+++ b/gfx/layers/basic/BasicImages.cpp
@@ -30,16 +30,17 @@ namespace mozilla {
 namespace layers {
 
 class BasicPlanarYCbCrImage : public RecyclingPlanarYCbCrImage
 {
 public:
   BasicPlanarYCbCrImage(const gfx::IntSize& aScaleHint, gfxImageFormat aOffscreenFormat, BufferRecycleBin *aRecycleBin)
     : RecyclingPlanarYCbCrImage(aRecycleBin)
     , mScaleHint(aScaleHint)
+    , mStride(0)
     , mDelayedConversion(false)
   {
     SetOffscreenFormat(aOffscreenFormat);
   }
 
   ~BasicPlanarYCbCrImage()
   {
     if (mDecodedBuffer) {