diff --git a/src/applications/auth/controller/PhabricatorLDAPRegistrationController.php b/src/applications/auth/controller/PhabricatorLDAPRegistrationController.php
index 111c21a9e3..73b9958625 100644
--- a/src/applications/auth/controller/PhabricatorLDAPRegistrationController.php
+++ b/src/applications/auth/controller/PhabricatorLDAPRegistrationController.php
@@ -50,7 +50,7 @@ extends PhabricatorAuthController {
     $e_realname = true;
 
     $user = new PhabricatorUser();
-    $user->setUsername();
+    $user->setUsername($provider->retrieveUsername());
     $user->setRealname($provider->retrieveUserRealName());
 
     $new_email = $provider->retrieveUserEmail();
diff --git a/src/applications/auth/ldap/PhabricatorLDAPProvider.php b/src/applications/auth/ldap/PhabricatorLDAPProvider.php
index 0d98d2beef..496551206a 100644
--- a/src/applications/auth/ldap/PhabricatorLDAPProvider.php
+++ b/src/applications/auth/ldap/PhabricatorLDAPProvider.php
@@ -99,7 +99,7 @@ final class PhabricatorLDAPProvider {
   }
 
   public function retrieveUsername() {
-    return $this->userData[$this->getSearchAttribute()][0];
+    return $this->userData[$this->getUsernameAttribute()][0];
   }
 
   public function getConnection() {