1 files changed, 2 insertions, 2 deletions
diff --git a/util.c b/util.c
index d51f50f..21b35ff 100644
--- a/util.c
+++ b/util.c
@@ -48,8 +48,8 @@
 char *ipv6_l4hdr(const struct pool *p, int idx, size_t offset, uint8_t *proto,
 		 size_t *dlen)
 {
-	struct ipv6_opt_hdr *o;
-	struct ipv6hdr *ip6h;
+	const struct ipv6_opt_hdr *o;
+	const struct ipv6hdr *ip6h;
 	char *base;
 	int hdrlen;
 	uint8_t nh;