diff --git a/lib/redmine_contracts/patches/project_patch.rb b/lib/redmine_contracts/patches/project_patch.rb
index 195b7eb..f462171 100644
--- a/lib/redmine_contracts/patches/project_patch.rb
+++ b/lib/redmine_contracts/patches/project_patch.rb
@@ -16,27 +16,6 @@ module RedmineContracts
       end
 
       module InstanceMethods
-        def billable_activities
-          activities_sorted_by_billable[:billable]
-        end
-
-        def non_billable_activities
-          activities_sorted_by_billable[:non_billable]
-        end
-
-        private
-
-        def activities_sorted_by_billable
-          split_activities = activities.partition do |activity|
-            activity.billable?
-          end
-
-          {
-            :billable => split_activities.first,
-            :non_billable => split_activities.second
-          }
-
-        end
       end
     end
   end