diff --git a/inc/inc.ClassLdapAuthentication.php b/inc/inc.ClassLdapAuthentication.php
index db9ae1449..29e434e1a 100644
--- a/inc/inc.ClassLdapAuthentication.php
+++ b/inc/inc.ClassLdapAuthentication.php
@@ -199,7 +199,7 @@ class SeedDMS_LdapAuthentication extends SeedDMS_Authentication {
 					if (!is_bool($info) && $info["count"]>0) {
 						$dn = $info[0]['dn'];
 						/* Set username to login name in case the email was used for authentication */
-						$username = $info[0][$ldapSearchAttribut][0];
+						$username = $info[0][strtolower($ldapSearchAttribut)][0];
 					}
 				}
 			} elseif(!empty($settings->_enableLoginByEmail)) {