diff --git a/inc/drivers_ldap.php b/inc/drivers_ldap.php
index 4c5f2a4b..c3a704a7 100644
--- a/inc/drivers_ldap.php
+++ b/inc/drivers_ldap.php
@@ -277,7 +277,7 @@ function sync_user_from_LDAP( Principal &$principal, $mapping, $ldap_values ) {
       }
     }
   }
-  if ( $principal->Exists ) {
+  if ( $principal->Exists() ) {
     $principal->Update($fields_to_set);
   }
   else {