diff --git a/libsofia-sip-ua/stun/stun.c b/libsofia-sip-ua/stun/stun.c
index 1f7e1392540bc4f383f1e55b8f73e64dfdd6f107..478a315becb9d40c0ae10b207c67bda467b20bbb 100644
--- a/libsofia-sip-ua/stun/stun.c
+++ b/libsofia-sip-ua/stun/stun.c
@@ -2614,6 +2614,9 @@ int stun_atoaddr(su_home_t *home,
   dstaddr = (su_sockaddr_t *) info->ai_addr;
 
   /* note: works only for IPv4 */
+  if (ai_family != AF_INET) 
+    return -1;
+
   hints->ai_family = ai_family;
 
   port = strstr(in, ":");