diff --git a/server/modules/authentication/gitlab/authentication.js b/server/modules/authentication/gitlab/authentication.js
index 15d5229b..f060ad8e 100644
--- a/server/modules/authentication/gitlab/authentication.js
+++ b/server/modules/authentication/gitlab/authentication.js
@@ -15,6 +15,8 @@ module.exports = {
         clientSecret: conf.clientSecret,
         callbackURL: conf.callbackURL,
         baseURL: conf.baseUrl,
+        authorizationURL: conf.authorizationURL || (conf.baseUrl + '/oauth/authorize'),
+        tokenURL: conf.tokenURL || (conf.baseUrl + '/oauth/token'),
         scope: ['read_user'],
         passReqToCallback: true
       }, async (req, accessToken, refreshToken, profile, cb) => {
diff --git a/server/modules/authentication/gitlab/definition.yml b/server/modules/authentication/gitlab/definition.yml
index e18dccb8..ec26d613 100644
--- a/server/modules/authentication/gitlab/definition.yml
+++ b/server/modules/authentication/gitlab/definition.yml
@@ -24,3 +24,13 @@ props:
     hint: For self-managed GitLab instances, define the base URL (e.g. https://gitlab.example.com). Leave default for GitLab.com SaaS (https://gitlab.com).
     default: https://gitlab.com
     order: 3
+  authorizationURL:
+    type: String
+    title: Authorization URL
+    hint: For self-managed GitLab instances, define an alternate authorization URL (e.g. http://example.com/oauth/authorize). Leave empty otherwise.
+    order: 4
+  tokenURL:
+    type: String
+    title: Token URL
+    hint: For self-managed GitLab instances, define an alternate token URL (e.g. http://example.com/oauth/token). Leave empty otherwise.
+    order: 5