diff --git a/lib/cas_helpers.rb b/lib/cas_helpers.rb
index db08148..d9b7999 100644
--- a/lib/cas_helpers.rb
+++ b/lib/cas_helpers.rb
@@ -18,7 +18,7 @@ def need_authentication(request, session)
   end
 
   def process_cas_login(request, session)
-    if request[:ticket] && request[:ticket] != session[:ticket]
+    if request[:ticket] && request[:ticket] != session[:cas_ticket]
 
       service_url = read_service_url(request)
       st = read_ticket(request[:ticket], service_url)