diff --git a/libavcodec/vorbis.c b/libavcodec/vorbis.c
index 86d10407f4..61c395e71e 100644
--- a/libavcodec/vorbis.c
+++ b/libavcodec/vorbis.c
@@ -105,7 +105,7 @@ int ff_vorbis_len2vlc(uint8_t *bits, uint32_t *codes, unsigned num)
         exit_at_level[i] = 0;
         // construct code (append 0s to end) and introduce new exits
         for (j = i + 1 ;j <= bits[p]; ++j)
-            exit_at_level[j] = code + (1 << (j - 1));
+            exit_at_level[j] = code + (1u << (j - 1));
         codes[p] = code;
 
 #ifdef DEBUG