diff --git a/app/controllers/contest_management_controller.rb b/app/controllers/contest_management_controller.rb
--- a/app/controllers/contest_management_controller.rb
+++ b/app/controllers/contest_management_controller.rb
@@ -37,7 +37,7 @@
   end
 
   def change_contest_mode
-    if ['standard', 'contest', 'indv-contest'].include? params[:id]
+    if ['standard', 'contest', 'indv-contest', 'analysis'].include? params[:id]
       config = GraderConfiguration.find_by_key('system.mode')
       config.value = params[:id]
       config.save