diff --git a/libavcodec/osq.c b/libavcodec/osq.c
index 650cfcd98c..fa4aeee35e 100644
--- a/libavcodec/osq.c
+++ b/libavcodec/osq.c
@@ -320,7 +320,7 @@ 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];