diff --git a/app/models/tag_group.rb b/app/models/tag_group.rb
index cf83c9ff2da..c56392ab775 100644
--- a/app/models/tag_group.rb
+++ b/app/models/tag_group.rb
@@ -6,6 +6,7 @@ class TagGroup < ActiveRecord::Base
   has_many :tag_group_memberships, dependent: :destroy
   has_many :tags, through: :tag_group_memberships
   has_many :category_tag_groups, dependent: :destroy
+  has_many :category_required_tag_groups, dependent: :destroy
   has_many :categories, through: :category_tag_groups
   has_many :tag_group_permissions, dependent: :destroy