diff --git a/libavcodec/ituh263dec.c b/libavcodec/ituh263dec.c
index 6d1d771c16..c1005b0994 100644
--- a/libavcodec/ituh263dec.c
+++ b/libavcodec/ituh263dec.c
@@ -1286,7 +1286,7 @@ int ff_h263_decode_picture_header(MpegEncContext *s)
         for(i=0; i<13; i++){
             for(j=0; j<3; j++){
                 int v= get_bits(&s->gb, 8);
-                v |= get_sbits(&s->gb, 8)<<8;
+                v |= get_sbits(&s->gb, 8) * (1 << 8);
                 av_log(s->avctx, AV_LOG_DEBUG, " %5d", v);
             }
             av_log(s->avctx, AV_LOG_DEBUG, "\n");