diff --git a/app/controllers/main_controller.rb b/app/controllers/main_controller.rb
--- a/app/controllers/main_controller.rb
+++ b/app/controllers/main_controller.rb
@@ -192,7 +192,7 @@
 
   def confirm_contest_start
     user = User.find(session[:user_id])
-    if request.method == :post
+    if request.method == 'POST'
       user.update_start_time
       redirect_to :action => 'list'
     else
diff --git a/app/views/main/confirm_contest_start.html.haml b/app/views/main/confirm_contest_start.html.haml
--- a/app/views/main/confirm_contest_start.html.haml
+++ b/app/views/main/confirm_contest_start.html.haml
@@ -12,5 +12,5 @@
 
       =t 'main.confirm_contest_start.timer_starts_after_click'
 
-      = form_tag :action => 'confirm_contest_start', :method => 'post' do
+      = form_tag :action => 'confirm_contest_start' do
         = submit_tag t('main.confirm_contest_start.start_button'), :confirm => t('main.confirm_contest_start.start_button_confirm')