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-rw-r--r--app/validators/unique_username_validator.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/app/validators/unique_username_validator.rb b/app/validators/unique_username_validator.rb
index c76407b16..fb67105dd 100644
--- a/app/validators/unique_username_validator.rb
+++ b/app/validators/unique_username_validator.rb
@@ -6,7 +6,7 @@ class UniqueUsernameValidator < ActiveModel::Validator
 
     normalized_username = account.username.downcase.delete('.')
 
-    scope = Account.where(domain: nil, username: normalized_username)
+    scope = Account.where(domain: nil).where('lower(username) = ?', normalized_username)
     scope = scope.where.not(id: account.id) if account.persisted?
 
     account.errors.add(:username, :taken) if scope.exists?