diff --git a/libavcodec/msrledec.c b/libavcodec/msrledec.c
index 9d05bc8fc5..3aa5e3ceb9 100644
--- a/libavcodec/msrledec.c
+++ b/libavcodec/msrledec.c
@@ -63,6 +63,7 @@ static int msrle_decode_pal4(AVCodecContext *avctx, AVPicture *pic,
                 stream_byte = bytestream2_get_byte(gb);
                 pixel_ptr += stream_byte;
                 stream_byte = bytestream2_get_byte(gb);
+                avpriv_request_sample(avctx, "Unused stream byte %X", stream_byte);
             } else {
                 // copy pixels from encoded stream
                 odd_pixel =  stream_byte & 1;