diff --git a/ldap-overleaf-sl/sharelatex/AuthenticationManager.js b/ldap-overleaf-sl/sharelatex/AuthenticationManager.js
index edc8e9a..8d897fc 100644
--- a/ldap-overleaf-sl/sharelatex/AuthenticationManager.js
+++ b/ldap-overleaf-sl/sharelatex/AuthenticationManager.js
@@ -274,11 +274,11 @@ const AuthenticationManager = {
     const ldap_reader_pass = process.env.LDAP_BIND_PW
     const ldap_base = process.env.LDAP_BASE
     var mail = query.email
-    const filterstr = '(&' + process.env.LDAP_GROUP_FILTER + '(mail=' + mail + '))'
+    const uid = query.email.split('@')[0]
+    const filterstr = '(&' + process.env.LDAP_GROUP_FILTER + '(uid=' + uid + '))'
     var userDn = "" //'uid=' + uid + ',' + ldap_bd;
     var firstname = ""
     var lastname = ""
-    var uid = ""
     var isAdmin = false
     // check bind
     try {