diff --git a/internal/dnsforward/http.go b/internal/dnsforward/http.go
index 096c3d73..d0fd0716 100644
--- a/internal/dnsforward/http.go
+++ b/internal/dnsforward/http.go
@@ -232,13 +232,7 @@ func (req *jsonDNSConfig) checkUpstreamMode() (err error) {
 	}
 
 	switch um := *req.UpstreamMode; um {
-	case "":
-		return nil
-	case "parallel":
-		return nil
-	case "fastest_addr":
-		return nil
-	case "load_balance":
+	case "", "parallel", "fastest_addr", "load_balance":
 		return nil
 	default:
 		return fmt.Errorf("upstream_mode: incorrect value %q", um)
@@ -474,9 +468,7 @@ func (s *Server) setConfig(dc *jsonDNSConfig) (shouldRestart bool) {
 // case of invalid value.
 func mustParseUpstreamMode(mode string) (um string) {
 	switch mode {
-	case "":
-		return UpstreamModeTypeLoadBalance
-	case "load_balance":
+	case "", "load_balance":
 		return UpstreamModeTypeLoadBalance
 	case "parallel":
 		return UpstreamModeTypeParallel