diff --git a/libavcodec/aasc.c b/libavcodec/aasc.c
index 65ef782688..469fc5eef6 100644
--- a/libavcodec/aasc.c
+++ b/libavcodec/aasc.c
@@ -137,7 +137,7 @@ static int aasc_decode_frame(AVCodecContext *avctx,
         return ret;
 
     /* report that the buffer was completely consumed */
-    return buf_size;
+    return avpkt->size;
 }
 
 static av_cold int aasc_decode_end(AVCodecContext *avctx)