diff --git a/app/logical/moderator/tag_batch_change.rb b/app/logical/moderator/tag_batch_change.rb
index 0a6fb7274..f8258a963 100644
--- a/app/logical/moderator/tag_batch_change.rb
+++ b/app/logical/moderator/tag_batch_change.rb
@@ -5,8 +5,8 @@ module Moderator
     def perform
       raise Error.new("antecedent is missing") if antecedent.blank?
 
-      normalized_antecedent = TagAlias.to_aliased(::Tag.scan_tags(antecedent))
-      normalized_consequent = TagAlias.to_aliased(::Tag.scan_tags(consequent))
+      normalized_antecedent = TagAlias.to_aliased(::Tag.scan_tags(antecedent.mb_chars.downcase))
+      normalized_consequent = TagAlias.to_aliased(::Tag.scan_tags(consequent.mb_chars.downcase))
 
       updater = User.find(updater_id)