diff --git a/libavcodec/wavarc.c b/libavcodec/wavarc.c
index 0dc5849679..4bdd548d5f 100644
--- a/libavcodec/wavarc.c
+++ b/libavcodec/wavarc.c
@@ -311,7 +311,7 @@ static int decode_2slp(AVCodecContext *avctx,
             return AVERROR_EOF;
         case 8:
             s->nb_samples = get_urice(gb, 8);
-            if (s->nb_samples > 570) {
+            if (s->nb_samples > 570U) {
                 s->nb_samples = 570;
                 return AVERROR_INVALIDDATA;
             }
@@ -587,7 +587,7 @@ static int decode_5elp(AVCodecContext *avctx,
             return AVERROR_EOF;
         case 11:
             s->nb_samples = get_urice(gb, 8);
-            if (s->nb_samples > 570) {
+            if (s->nb_samples > 570U) {
                 s->nb_samples = 570;
                 return AVERROR_INVALIDDATA;
             }