diff --git a/app/models/tracker.rb b/app/models/tracker.rb
index af56d23bf..4ef18b7b0 100644
--- a/app/models/tracker.rb
+++ b/app/models/tracker.rb
@@ -34,7 +34,7 @@ class Tracker < ActiveRecord::Base
   end
 
   has_and_belongs_to_many :projects
-  has_and_belongs_to_many :courses
+  # has_and_belongs_to_many :courses
   has_and_belongs_to_many :custom_fields, :class_name => 'IssueCustomField', :join_table => "#{table_name_prefix}custom_fields_trackers#{table_name_suffix}", :association_foreign_key => 'custom_field_id'
   acts_as_list