diff --git a/src/dns-manager/nm-dns-manager.c b/src/dns-manager/nm-dns-manager.c
index 7a6fbbc9d..b0cdcc267 100644
--- a/src/dns-manager/nm-dns-manager.c
+++ b/src/dns-manager/nm-dns-manager.c
@@ -583,6 +583,7 @@ update_dns (NMDnsManager *self,
 	rc.nameservers = g_ptr_array_new ();
 	rc.domain = NULL;
 	rc.searches = g_ptr_array_new ();
+	rc.nis_domain = NULL;
 	rc.nis_servers = g_ptr_array_new ();
 
 	if (priv->ip4_vpn_config)