1 files changed, 2 insertions, 2 deletions
diff --git a/ndp.h b/ndp.h
index 7280b23..d857425 100644
--- a/ndp.h
+++ b/ndp.h
@@ -6,7 +6,7 @@
 #ifndef NDP_H
 #define NDP_H
 
-int ndp(struct ctx *c, struct icmp6hdr *ih, unsigned char *eh_source,
-	struct in6_addr *saddr);
+int ndp(struct ctx *c, const struct icmp6hdr *ih,
+	const unsigned char *eh_source, const struct in6_addr *saddr);
 
 #endif /* NDP_H */