diff --git a/htdocs/core/lib/files.lib.php b/htdocs/core/lib/files.lib.php
index 964e368c4e3..5a3a3a9307c 100644
--- a/htdocs/core/lib/files.lib.php
+++ b/htdocs/core/lib/files.lib.php
@@ -1552,10 +1552,9 @@ function dol_add_file_process($upload_dir, $allowoverwrite=0, $donotupdatesessio
 
 				// dol_sanitizeFileName the file name and lowercase extension
 				$info = pathinfo($destfull);
-				$destfull = $info['dirname'].'/'.dol_sanitizeFileName($info['filename'].'.'.strtolower($info['extension']));
+				$destfull = $info['dirname'].'/'.dol_sanitizeFileName($info['filename'].($info['extension']!='' ? ('.'.strtolower($info['extension'])) : ''));
 				$info = pathinfo($destfile);
-				$destfile = dol_sanitizeFileName($info['filename'].'.'.strtolower($info['extension']));
-
+				$destfile = dol_sanitizeFileName($info['filename'].($info['extension']!='' ? ('.'.strtolower($info['extension'])) : ''));
 				$resupload = dol_move_uploaded_file($TFile['tmp_name'][$i], $destfull, $allowoverwrite, 0, $TFile['error'][$i], 0, $varfiles);
 
 				if (is_numeric($resupload) && $resupload > 0)   // $resupload can be 'ErrorFileAlreadyExists'