diff --git a/libavcodec/osq.c b/libavcodec/osq.c
index 7d0e8a87d5..1bd4485f07 100644
--- a/libavcodec/osq.c
+++ b/libavcodec/osq.c
@@ -321,7 +321,7 @@ static int do_decode(AVCodecContext *avctx, AVFrame *frame, int decorrelate, int
             cb->prev = prev;
 
             if (downsample)
-                dst[n] *= 256;
+                dst[n] *= 256U;
 
             dst[E] = dst[D];
             dst[D] = dst[C];