diff --git a/libavcodec/mjpegdec.c b/libavcodec/mjpegdec.c
index 22ca69f84127f745c613dad84b66f89ea9025267..d1dca84d36990ba41c27be8072435cf2739c791e 100644
--- a/libavcodec/mjpegdec.c
+++ b/libavcodec/mjpegdec.c
@@ -1078,7 +1078,7 @@ static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int nb_components, int p
                     return -1;
 
                 left[i] = buffer[mb_x][i] =
-                    mask & (pred + (dc * (1 << point_transform)));
+                    mask & (pred + (unsigned)(dc * (1 << point_transform)));
             }
 
             if (s->restart_interval && !--s->restart_count) {