diff --git a/libswscale/swscale.c b/libswscale/swscale.c
index 1d623e77a2..f529331f0f 100644
--- a/libswscale/swscale.c
+++ b/libswscale/swscale.c
@@ -208,8 +208,9 @@ static void lumRangeToJpeg16_c(int16_t *_dst, int width)
 {
     int i;
     int32_t *dst = (int32_t *) _dst;
-    for (i = 0; i < width; i++)
-        dst[i] = (FFMIN(dst[i], 30189 << 4) * 4769 - (39057361 << 2)) >> 12;
+    for (i = 0; i < width; i++) {
+        dst[i] = ((int)(FFMIN(dst[i], 30189 << 4) * 4769U - (39057361 << 2))) >> 12;
+    }
 }
 
 static void lumRangeFromJpeg16_c(int16_t *_dst, int width)