diff --git a/app/models/contest.rb b/app/models/contest.rb
--- a/app/models/contest.rb
+++ b/app/models/contest.rb
@@ -3,6 +3,6 @@
   has_and_belongs_to_many :users
   has_and_belongs_to_many :problems
 
-  scope :enabled, :conditions => {:enabled => true}
+  scope :enabled, -> { where(enabled: true) }
 
 end