diff --git a/kdc/connect.c b/kdc/connect.c
index 19f609f39..3383d6f13 100644
--- a/kdc/connect.c
+++ b/kdc/connect.c
@@ -311,7 +311,8 @@ init_sockets(struct descr **desc)
     parse_ports(port_str);
     d = malloc(addresses.len * num_ports * sizeof(*d));
     if (d == NULL)
-	krb5_errx(context, 1, "malloc(%u) failed", num_ports * sizeof(*d));
+	krb5_errx(context, 1, "malloc(%lu) failed",
+		  (unsigned long)num_ports * sizeof(*d));
 
     for (i = 0; i < num_ports; i++){
 	for (j = 0; j < addresses.len; ++j) {
@@ -336,7 +337,8 @@ init_sockets(struct descr **desc)
     krb5_free_addresses (context, &addresses);
     d = realloc(d, num * sizeof(*d));
     if (d == NULL && num != 0)
-	krb5_errx(context, 1, "realloc(%u) failed", num * sizeof(*d));
+	krb5_errx(context, 1, "realloc(%lu) failed",
+		  (unsigned long)num * sizeof(*d));
     reinit_descrs (d, num);
     *desc = d;
     return num;