diff --git a/app/controllers/users/omniauth_callbacks_controller.rb b/app/controllers/users/omniauth_callbacks_controller.rb
index 42fc78f3b62..2be789910be 100644
--- a/app/controllers/users/omniauth_callbacks_controller.rb
+++ b/app/controllers/users/omniauth_callbacks_controller.rb
@@ -11,7 +11,8 @@ class Users::OmniauthCallbacksController < ApplicationController
     Auth::OpenIdAuthenticator.new("yahoo", "https://me.yahoo.com", trusted: true),
     Auth::GithubAuthenticator.new,
     Auth::TwitterAuthenticator.new,
-    Auth::PersonaAuthenticator.new
+    Auth::PersonaAuthenticator.new,
+    Auth::CasAuthenticator.new
   ]
 
   skip_before_filter :redirect_to_login_if_required
diff --git a/lib/auth.rb b/lib/auth.rb
index ead065a5a9e..910a5863a0f 100644
--- a/lib/auth.rb
+++ b/lib/auth.rb
@@ -7,3 +7,4 @@ require_dependency 'auth/open_id_authenticator'
 require_dependency 'auth/github_authenticator'
 require_dependency 'auth/twitter_authenticator'
 require_dependency 'auth/persona_authenticator'
+require_dependency 'auth/cas_authenticator'