diff --git a/src/or/dns.c b/src/or/dns.c
index 4279c6d09b..5d12dec96d 100644
--- a/src/or/dns.c
+++ b/src/or/dns.c
@@ -1576,6 +1576,7 @@ eventdns_wildcard_check_callback(int result, char type, int count, int ttl,
                                  void *addresses, void *arg)
 {
   static int notice_given = 0;
+  (void)ttl;
   if (result == DNS_ERR_NONE && type == DNS_IPv4_A && count) {
     uint32_t *addrs = addresses;
     int i;