diff --git a/libavcodec/cbs_av1.c b/libavcodec/cbs_av1.c
index 1d9ac5ab44..fb82996022 100644
--- a/libavcodec/cbs_av1.c
+++ b/libavcodec/cbs_av1.c
@@ -301,7 +301,7 @@ static int cbs_av1_write_increment(CodedBitstreamContext *ctx, PutBitContext *pb
         return AVERROR(ENOSPC);
 
     if (len > 0)
-        put_bits(pbc, len, (1 << len) - 1 - (value != range_max));
+        put_bits(pbc, len, (1U << len) - 1 - (value != range_max));
 
     CBS_TRACE_WRITE_END_NO_SUBSCRIPTS();