diff --git a/libavcodec/mjpegdec.c b/libavcodec/mjpegdec.c
index 2ce351ddbc..713526be4c 100644
--- a/libavcodec/mjpegdec.c
+++ b/libavcodec/mjpegdec.c
@@ -1002,7 +1002,7 @@ 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) {