diff --git a/htdocs/lib/functions.lib.php b/htdocs/lib/functions.lib.php
index 23f488aea2b..fbbe1688203 100644
--- a/htdocs/lib/functions.lib.php
+++ b/htdocs/lib/functions.lib.php
@@ -1524,6 +1524,8 @@ function img_allow($allow,$alt='default')
  */
 function img_mime($file,$alt='')
 {
+	require_once(DOL_DOCUMENT_ROOT.'/lib/files.lib.php');
+	
     $mimetype=dol_mimetype($file,'',1);
     $mimeimg=dol_mimetype($file,'',2);