diff --git a/app/models/issue.rb b/app/models/issue.rb
index ee317b006..663cfd100 100644
--- a/app/models/issue.rb
+++ b/app/models/issue.rb
@@ -1904,7 +1904,7 @@ class Issue < ApplicationRecord
       end
 
       # ancestors will be recursively updated
-      p.save(:validate => false)
+      p.save(:validate => false) if p.changed?
     end
   end