diff --git a/sites/all/modules/unl/unl_migration.php b/sites/all/modules/unl/unl_migration.php
index 6506762ee29abc00278eb2a6d3c689512c0c3099..bd3a41c473482a6d677a58471677bbbf8a321a06 100644
--- a/sites/all/modules/unl/unl_migration.php
+++ b/sites/all/modules/unl/unl_migration.php
@@ -778,6 +778,7 @@ class Unl_Migration_Tool
                 $this->_frontier = NULL;
                 $this->_log('Error: could not connect to frontier with user ' . $this->_frontierUser . '.');
             }
+            ftp_pasv($this->_frontier, TRUE);
         }
         return $this->_frontier;
     }