diff --git a/phpgwapi/inc/class.auth_pam.inc.php b/phpgwapi/inc/class.auth_pam.inc.php
index 59c3073377..2cb8082a8e 100644
--- a/phpgwapi/inc/class.auth_pam.inc.php
+++ b/phpgwapi/inc/class.auth_pam.inc.php
@@ -24,7 +24,7 @@
 	{
 		function authenticate($username, $passwd)
 		{
-			if (pam_auth($username, get_magic_quotes_gpc() ? stripslashes($passwd) : $passwd, $error)) 
+			if (pam_auth($username, get_magic_quotes_gpc() ? stripslashes($passwd) : $passwd, &$error)) 
 			{
 				return True;
 			}