diff --git a/system-settings/plugins/ifcfg-rh/writer.c b/system-settings/plugins/ifcfg-rh/writer.c
index d7a7ef2122..02e4fa1146 100644
--- a/system-settings/plugins/ifcfg-rh/writer.c
+++ b/system-settings/plugins/ifcfg-rh/writer.c
@@ -794,7 +794,7 @@ write_connection_setting (NMSettingConnection *s_con, shvarFile *ifcfg)
 
 	svSetValue (ifcfg, "LAST_CONNECT", NULL, FALSE);
 	if (nm_setting_connection_get_timestamp (s_con)) {
-		tmp = g_strdup_printf ("%llu", nm_setting_connection_get_timestamp (s_con));
+		tmp = g_strdup_printf ("%" G_GUINT64_FORMAT, nm_setting_connection_get_timestamp (s_con));
 		svSetValue (ifcfg, "LAST_CONNECT", tmp, FALSE);
 		g_free (tmp);
 	}