diff --git a/Makefile b/Makefile
index 0b44a3e02..84d86812e 100644
--- a/Makefile
+++ b/Makefile
@@ -51,6 +51,7 @@ build_for_integration_test:
 		-o bin/br.test && \
 	$(GOBUILD) $(RACEFLAG) -o bin/locker tests/br_key_locked/*.go && \
 	$(GOBUILD) $(RACEFLAG) -o bin/gc tests/br_z_gc_safepoint/*.go && \
+	$(GOBUILD) $(RACEFLAG) -o bin/oauth tests/br_gcs/*.go && \
 	$(GOBUILD) $(RACEFLAG) -o bin/rawkv tests/br_rawkv/*.go) || (make failpoint-disable && exit 1)
 	@make failpoint-disable
 
diff --git a/tests/br_gcs/oauth.go b/tests/br_gcs/oauth.go
new file mode 100644
index 000000000..c9fdc8027
--- /dev/null
+++ b/tests/br_gcs/oauth.go
@@ -0,0 +1,25 @@
+// Copyright 2020 PingCAP, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"net/http"
+)
+
+func main() {
+	http.HandleFunc("/oauth/token", func(w http.ResponseWriter, r *http.Request) {
+		_, _ = w.Write([]byte(`{"access_token": "ok", "token_type":"service_account", "expires_in":3600}`))
+	})
+	_ = http.ListenAndServe(":5000", nil)
+}
diff --git a/tests/br_gcs/oauth.py b/tests/br_gcs/oauth.py
deleted file mode 100644
index 24e686184..000000000
--- a/tests/br_gcs/oauth.py
+++ /dev/null
@@ -1,9 +0,0 @@
-#!/usr/bin/env python3
-
-from flask import Flask
-
-app = Flask(__name__)
-
-@app.route('/oauth/token', methods=['GET', 'POST'])
-def oauth():
-    return '{"access_token": "ok", "token_type":"service_account", "expires_in":3600}'
diff --git a/tests/br_gcs/run.sh b/tests/br_gcs/run.sh
index a5be052de..b40c74452 100755
--- a/tests/br_gcs/run.sh
+++ b/tests/br_gcs/run.sh
@@ -36,7 +36,7 @@ while ! curl -o /dev/null -v -s "http://$GCS_HOST:$GCS_PORT/"; do
 done
 
 # start oauth server
-FLASK_APP=tests/$TEST_NAME/oauth.py flask run &
+bin/oauth &
 OAUTH_ID=$!
 
 stop_gcs() {