diff --git a/jhub_remote_user_authenticator/remote_user_auth.py b/jhub_remote_user_authenticator/remote_user_auth.py
index f9e4d80e83d016c4c4ba24f6901f3b2278f4541f..e7d87af7c281b21ce34395c56c977c4e00023855 100644
--- a/jhub_remote_user_authenticator/remote_user_auth.py
+++ b/jhub_remote_user_authenticator/remote_user_auth.py
@@ -57,7 +57,7 @@ class RemoteUserAuthenticator(Authenticator):
         ]
     
     def login_url(self, base_url):
-        return self.domain + '/Shibboleth.sso/Login
+        return self.domain + '/Shibboleth.sso/Login'
 
     def logout_url(self, base_url):
         return self.domain + '/Shibboleth.sso/Logout?return=/'