diff --git a/libavcodec/mpeg12.c b/libavcodec/mpeg12.c
index 89793a5794..ed7409157a 100644
--- a/libavcodec/mpeg12.c
+++ b/libavcodec/mpeg12.c
@@ -2239,7 +2239,7 @@ static int mpeg_decode_frame(AVCodecContext *avctx,
 
             *data_size = sizeof(AVFrame);
         }
-        return 0;
+        return buf_size;
     }
 
     if(s2->flags&CODEC_FLAG_TRUNCATED){