diff --git a/lib/krb5/addr_families.c b/lib/krb5/addr_families.c
index 1e107222e..cb49a5f69 100644
--- a/lib/krb5/addr_families.c
+++ b/lib/krb5/addr_families.c
@@ -629,7 +629,7 @@ krb5_boolean
 krb5_sockaddr_uninteresting(const struct sockaddr *sa)
 {
     struct addr_operations *a = find_af(sa->sa_family);
-    if (a == NULL)
+    if (a == NULL || a->uninteresting == NULL)
 	return TRUE;
     return (*a->uninteresting)(sa);
 }