diff --git a/app/assets/javascripts/discourse/controllers/login.js.es6 b/app/assets/javascripts/discourse/controllers/login.js.es6
index cd81f119c01..02969cf5e13 100644
--- a/app/assets/javascripts/discourse/controllers/login.js.es6
+++ b/app/assets/javascripts/discourse/controllers/login.js.es6
@@ -129,7 +129,7 @@ export default Ember.Controller.extend(ModalFunctionality, {
       if(customLogin){
         customLogin();
       } else {
-        var authUrl = Discourse.getURL("/auth/" + name);
+        const authUrl = loginMethod.get('customUrl') || Discourse.getURL("/auth/" + name);
         if (loginMethod.get("fullScreenLogin")) {
           window.location = authUrl;
         } else {
diff --git a/lib/plugin/auth_provider.rb b/lib/plugin/auth_provider.rb
index cbc12c6f450..570a245b081 100644
--- a/lib/plugin/auth_provider.rb
+++ b/lib/plugin/auth_provider.rb
@@ -2,7 +2,7 @@ class Plugin::AuthProvider
 
   def self.auth_attributes
     [:glyph, :background_color, :title, :message, :frame_width, :frame_height, :authenticator,
-     :title_setting, :enabled_setting, :full_screen_login]
+     :title_setting, :enabled_setting, :full_screen_login, :custom_url]
   end
 
   attr_accessor(*auth_attributes)
@@ -13,6 +13,7 @@ class Plugin::AuthProvider
 
   def to_json
     result = {name: name}
+    result['customUrl'] = custom_url if custom_url
     result['titleOverride'] = title if title
     result['titleSetting'] = title_setting if title_setting
     result['enabledSetting'] = enabled_setting if enabled_setting