diff --git a/libnm-core/nm-keyfile-reader.c b/libnm-core/nm-keyfile-reader.c
index 7cfa05bdfd..c639fc27bc 100644
--- a/libnm-core/nm-keyfile-reader.c
+++ b/libnm-core/nm-keyfile-reader.c
@@ -1254,7 +1254,7 @@ set_default_for_missing_key (NMSetting *setting, const char *property)
 	/* Set a value different from the default value of the property's spec */
 
 	if (NM_IS_SETTING_VLAN (setting) && !strcmp (property, NM_SETTING_VLAN_FLAGS))
-		g_object_set (setting, property, 0, NULL);
+		g_object_set (setting, property, (NMVlanFlags) 0, NULL);
 }
 
 static void