diff --git a/libavcodec/shorten.c b/libavcodec/shorten.c
index 18a12d0b97..79656e7757 100644
--- a/libavcodec/shorten.c
+++ b/libavcodec/shorten.c
@@ -177,7 +177,7 @@ static void fix_bitshift(ShortenContext *s, int32_t *buffer)
             buffer[i] = 0;
     } else if (s->bitshift != 0) {
         for (i = 0; i < s->blocksize; i++)
-            buffer[i] *= 1 << s->bitshift;
+            buffer[i] *= 1U << s->bitshift;
     }
 }