diff --git a/htdocs/product/stock/class/mouvementstock.class.php b/htdocs/product/stock/class/mouvementstock.class.php
index 31e66796a48..b1e184c3fe2 100644
--- a/htdocs/product/stock/class/mouvementstock.class.php
+++ b/htdocs/product/stock/class/mouvementstock.class.php
@@ -976,7 +976,7 @@ class MouvementStock extends CommonObject
 				if ($origin_type) {
 					// Separate originetype with "@" : left part is class name, right part is module name
 					$origin_type_array = explode('@', $origin_type);
-					$classname = ucfirst($origin_type_array[0]);
+					$classname = strtolower($origin_type_array[0]);
 					$modulename = empty($origin_type_array[1]) ? $classname : $origin_type_array[1];
 					$result = dol_include_once('/'.$modulename.'/class/'.strtolower($classname).'.class.php');
 					if ($result) {