diff --git a/app/models/authenticator/httpd.rb b/app/models/authenticator/httpd.rb
index ba71c571a42..d6c6bb4208f 100644
--- a/app/models/authenticator/httpd.rb
+++ b/app/models/authenticator/httpd.rb
@@ -123,6 +123,7 @@ def username_to_upn_name(user_attrs)
       return user_attrs[:username] if user_attrs[:domain].nil?
 
       user_name = user_attrs[:username].split("@").first
+      user_name = user_name.split("\\").last if user_name.include?("\\")
       "#{user_name}@#{user_attrs[:domain]}".downcase
     end