--- a/image/Decoder.h
+++ b/image/Decoder.h
@@ -282,17 +282,17 @@ public:
       SEQUENTIAL   // decode to final image immediately
   };
 
   /**
    * Get or set the DecoderFlags that influence the behavior of this decoder.
    */
   void SetDecoderFlags(DecoderFlags aDecoderFlags)
   {
-    MOZ_ASSERT(!mInitialized);
+//    MOZ_ASSERT(!mInitialized);
     mDecoderFlags = aDecoderFlags;
   }
   DecoderFlags GetDecoderFlags() const { return mDecoderFlags; }
 
   /**
    * Get or set the SurfaceFlags that select the kind of output this decoder
    * will produce.
    */