diff --git a/plugin.rb b/plugin.rb
index 3ac198f..bb69d21 100644
--- a/plugin.rb
+++ b/plugin.rb
@@ -196,7 +196,7 @@ SQL
   end
 
   class ::DiscourseAssign::AssignController < Admin::AdminController
-    before_filter :ensure_logged_in
+    before_action :ensure_logged_in
 
     def suggestions
       users = [current_user]