diff --git a/lib/Horde/Auth/Login.php b/lib/Horde/Auth/Login.php
index 636c6e8..e890751 100644
--- a/lib/Horde/Auth/Login.php
+++ b/lib/Horde/Auth/Login.php
@@ -71,7 +71,7 @@ protected function _authenticate($userId, $credentials)
             throw new Horde_Auth_Exception('', Horde_Auth::REASON_BADLOGIN);
         }
 
-        $proc = @popen($this->_location . ' -c /bin/true ' . $userId, 'w');
+        $proc = @popen($this->_params['location'] . ' -c /bin/true ' . $userId, 'w');
         if (!is_resource($proc)) {
             throw new Horde_Auth_Exception('', Horde_Auth::REASON_FAILED);
         }