diff --git a/app/models/procedure.rb b/app/models/procedure.rb
index 947499b30..304c459dc 100644
--- a/app/models/procedure.rb
+++ b/app/models/procedure.rb
@@ -39,7 +39,7 @@ class Procedure < ActiveRecord::Base
   MAIL_TEMPLATE_TYPES = %w(InitiatedMail ReceivedMail ClosedMail RefusedMail WithoutContinuationMail)
 
   MAIL_TEMPLATE_TYPES.each do |name|
-    has_one "#{name.underscore}".to_sym, class_name: "Mails::#{name}"
+    has_one "#{name.underscore}".to_sym, class_name: "Mails::#{name}", dependent: :destroy
     define_method("#{name.underscore}_with_override") do
       self.send("#{name.underscore}_without_override") || Object.const_get("Mails::#{name}").default
     end