diff --git a/app/models/notification.rb b/app/models/notification.rb
index f9611d2a6c0..303025b2d4e 100644
--- a/app/models/notification.rb
+++ b/app/models/notification.rb
@@ -35,8 +35,14 @@ class Notification < ActiveRecord::Base
   end
 
   def self.mark_posts_read(user, topic_id, post_numbers)
-    Notification.where(user_id: user.id, topic_id: topic_id, post_number: post_numbers, read: false).update_all "read = 't'"
-    user.publish_notifications_state
+    count = Notification
+      .where(user_id: user.id,
+             topic_id: topic_id,
+             post_number: post_numbers,
+             read: false)
+      .update_all("read = 't'")
+
+    user.publish_notifications_state if count > 0
   end
 
   def self.interesting_after(min_date)