diff --git a/libavcodec/mjpegdec.c b/libavcodec/mjpegdec.c
index 69469c5229..2b5adfc61b 100644
--- a/libavcodec/mjpegdec.c
+++ b/libavcodec/mjpegdec.c
@@ -1157,7 +1157,7 @@ static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor,
                             if (s->interlaced && s->bottom_field)
                                 ptr16 += linesize >> 1;
                             pred &= mask;
-                            *ptr16= pred + (dc << point_transform);
+                            *ptr16= pred + ((unsigned)dc << point_transform);
                         }
                         if (++x == h) {
                             x = 0;