diff --git a/includes/wf_crm_webform_base.inc b/includes/wf_crm_webform_base.inc
index c8fc31309..5a6124e1a 100755
--- a/includes/wf_crm_webform_base.inc
+++ b/includes/wf_crm_webform_base.inc
@@ -948,11 +948,11 @@ abstract class wf_crm_webform_base {
       $entity_id = $this->ent[$entity][$n]['id'];
     }
     if (!empty($file[$val])) {
-      $fileHash = CRM_Core_BAO_File::generateFileHash($entity_id, $val);
+      $fileHash = is_callable(array('CRM_Core_BAO_File', 'generateFileHash')) ? '&fcs=' . CRM_Core_BAO_File::generateFileHash($entity_id, $val) : '';
       return array(
         'data_type' => 'File',
         'name' => CRM_Utils_File::cleanFileName($file[$val]['uri']),
-        'file_url'=> CRM_Utils_System::url('civicrm/file', "reset=1&id={$val}&eid={$entity_id}&fcs={$fileHash}", TRUE),
+        'file_url'=> CRM_Utils_System::url('civicrm/file', "reset=1&id={$val}&eid={$entity_id}{$fileHash}", TRUE),
         'icon' => file_icon_url((object) array('filemime' => $file[$val]['mime_type'])),
       );
     }