diff --git a/lib/topic_creator.rb b/lib/topic_creator.rb
index 66108966f25..76ba682cb33 100644
--- a/lib/topic_creator.rb
+++ b/lib/topic_creator.rb
@@ -208,7 +208,7 @@ class TopicCreator
   def add_users(topic, usernames)
     return unless usernames
 
-    names = usernames.split(',').map(&:downcase).flatten
+    names = usernames.split(',').flatten
     len = 0
 
     User.includes(:user_option).where(username_lower: names).find_each do |user|