diff --git a/gfx/layers/ImageLayers.h b/gfx/layers/ImageLayers.h
index fd1868916c9..f1ebe3c47fe 100644
--- a/gfx/layers/ImageLayers.h
+++ b/gfx/layers/ImageLayers.h
@@ -452,6 +452,11 @@ public:
   PRUint8 *CopyData(Data& aDest, gfxIntSize& aDestSize,
                     PRUint32& aDestBufferSize, const Data& aData);
 
+  /**
+   * Return a buffer to store image data in.
+   * The default implementation returns memory that can
+   * be freed wit delete[]
+   */
   virtual PRUint8* AllocateBuffer(PRUint32 aSize);
 
   /**
diff --git a/gfx/layers/basic/BasicImages.cpp b/gfx/layers/basic/BasicImages.cpp
index 21ea307354a..065596b82d1 100644
--- a/gfx/layers/basic/BasicImages.cpp
+++ b/gfx/layers/basic/BasicImages.cpp
@@ -206,7 +206,7 @@ BasicPlanarYCbCrImage::SetData(const Data& aData)
                   prescale ? mScaleHint.height : aData.mPicSize.height);
 
   mStride = gfxASurface::FormatStrideForWidth(format, size.width);
-  mBuffer = new PRUint8[size.height * mStride];
+  mBuffer = AllocateBuffer(size.height * mStride);
   if (!mBuffer) {
     // out of memory
     return;