diff --git a/test/test_external_jwt_authn.py b/test/test_external_jwt_authn.py
index 6b273e4ce..06627baf7 100644
--- a/test/test_external_jwt_authn.py
+++ b/test/test_external_jwt_authn.py
@@ -12,6 +12,8 @@ from tempfile import NamedTemporaryFile
 from Crypto.PublicKey import RSA
 from datetime import datetime, timedelta
 
+_PORT_NUMBER = 5001
+
 class JWTAuthTestCase(LiveServerTestCase):
   maxDiff = None
 
@@ -30,6 +32,9 @@ class JWTAuthTestCase(LiveServerTestCase):
     JWTAuthTestCase.private_key_data = private_key_data
 
   def create_app(self):
+    global _PORT_NUMBER
+    _PORT_NUMBER = _PORT_NUMBER + 1
+
     users = [
       {'name': 'cooluser', 'email': 'user@domain.com', 'password': 'password'},
       {'name': 'some.neat.user', 'email': 'neat@domain.com', 'password': 'foobar'}
@@ -37,6 +42,7 @@ class JWTAuthTestCase(LiveServerTestCase):
 
     jwt_app = Flask('testjwt')
     private_key = JWTAuthTestCase.private_key_data
+    jwt_app.config['LIVESERVER_PORT'] = _PORT_NUMBER
 
     def _get_basic_auth():
       data = base64.b64decode(request.headers['Authorization'][len('Basic '):])