diff --git a/app/models/topic.rb b/app/models/topic.rb
index b5378915979..6e10a13c2f4 100644
--- a/app/models/topic.rb
+++ b/app/models/topic.rb
@@ -1374,7 +1374,8 @@ class Topic < ActiveRecord::Base
       post_type: Post.types[:regular]
     ).last || first_post
 
-    update!(bumped_at: post.created_at)
+    self.bumped_at = post.created_at
+    self.save(validate: false)
   end
 
   def auto_close_threshold_reached?