diff --git a/app/models/task_manager/assignable.rb b/app/models/task_manager/assignable.rb
index <HASH>..<HASH> 100644
--- a/app/models/task_manager/assignable.rb
+++ b/app/models/task_manager/assignable.rb
@@ -1,6 +1,6 @@
 module TaskManager
   class Assignable < ActiveRecord::Base
-    belongs_to :plan
+    belongs_to :target, polymorphic: true
     belongs_to :assignee, polymorphic: true
 
     validates_presence_of :assignee_id, :assignee_type
Changed `plan` to a polymorphic `target`