diff --git a/modules/negotiate/lib/Auth/Source/Negotiate.php b/modules/negotiate/lib/Auth/Source/Negotiate.php
index 6f745e1c1147325e921d30df97f5d88ba3eff158..060e8e86f7d31fb243c635970ff32950f810c4be 100644
--- a/modules/negotiate/lib/Auth/Source/Negotiate.php
+++ b/modules/negotiate/lib/Auth/Source/Negotiate.php
@@ -16,6 +16,20 @@ class sspmod_negotiate_Auth_Source_Negotiate extends SimpleSAML_Auth_Source {
 
 	private $config;
 	protected $ldap = NULL;
+	protected $backend = '';
+	protected $hostname = '';
+	protected $port = 389;
+	protected $referrals = true;
+	protected $enableTLS = false;
+	protected $debugLDAP = false;
+	protected $timeout = 30;
+	protected $keytab = '';
+	protected $base = array();
+	protected $attr = 'uid';
+	protected $subnet = null;
+	protected $admin_user = null;
+	protected $admin_pw = null;
+	protected $attributes = null;
 
 	/**
 	 * Constructor for this authentication source.