diff --git a/libavcodec/cbs_av1.c b/libavcodec/cbs_av1.c
index 0abcba9c60..0adf83f770 100644
--- a/libavcodec/cbs_av1.c
+++ b/libavcodec/cbs_av1.c
@@ -383,7 +383,7 @@ static int cbs_av1_write_increment(CodedBitstreamContext *ctx, PutBitContext *pb
     }
 
     if (len > 0)
-        put_bits(pbc, len, (1 << len) - 1 - (value != range_max));
+        put_bits(pbc, len, (1U << len) - 1 - (value != range_max));
 
     return 0;
 }