diff --git a/lib/members.php b/lib/members.php
index 1ab196cfac45841e9b2c203f87c1f5ac92465953..4cb4b1896e29d72e86c6ed62031252244132e181 100644
--- a/lib/members.php
+++ b/lib/members.php
@@ -10,6 +10,7 @@ function __construct()
 {
 	// Connect and bind to ldap server
 	$this->conn = ldap_connect(_LDAP_SERVER);
+	ldap_set_option($this->conn, LDAP_OPT_PROTOCOL_VERSION, 3);
 	$bind = ldap_bind($this->conn);
 }