diff --git a/tools/pd-ut/alloc/server.go b/tools/pd-ut/alloc/server.go
index aced73467fb..a5643001142 100644
--- a/tools/pd-ut/alloc/server.go
+++ b/tools/pd-ut/alloc/server.go
@@ -28,7 +28,7 @@ import (
 	"go.uber.org/zap"
 )
 
-var statusAddress = flag.String("status-addr", "0.0.0.0:20180", "status address")
+var statusAddress = flag.String("status-addr", "0.0.0.0:0", "status address")
 
 func RunHTTPServer() *http.Server {
 	err := os.Setenv(tempurl.AllocURLFromUT, fmt.Sprintf("http://%s/alloc", *statusAddress))