diff --git a/infra/conf/router.go b/infra/conf/router.go
index a9f57cd6..79176fa5 100644
--- a/infra/conf/router.go
+++ b/infra/conf/router.go
@@ -636,7 +636,7 @@ func ParseRule(msg json.RawMessage) (*router.RoutingRule, error) {
 	if err != nil {
 		return nil, newError("invalid router rule").Base(err)
 	}
-	if strings.EqualFold(rawRule.Type, "field") {
+	if rawRule.Type == "" || strings.EqualFold(rawRule.Type, "field") {
 		fieldrule, err := parseFieldRule(msg)
 		if err != nil {
 			return nil, newError("invalid field rule").Base(err)