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-rw-r--r--lib/prefix.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/prefix.h b/lib/prefix.h
index 675f94d4..12c0d07e 100644
--- a/lib/prefix.h
+++ b/lib/prefix.h
@@ -199,7 +199,7 @@ extern void apply_mask_ipv6 (struct prefix_ipv6 *);
*((struct prefix_ipv6 *)(DST)) = *((const struct prefix_ipv6 *)(SRC));
extern int ip6_masklen (struct in6_addr);
-extern void masklen2ip6 (int, struct in6_addr *);
+extern void masklen2ip6 (const int, struct in6_addr *);
extern void str2in6_addr (const char *, struct in6_addr *);
extern const char *inet6_ntoa (struct in6_addr);