diff --git a/htdocs/core/modules/contract/doc/pdf_strato.modules.php b/htdocs/core/modules/contract/doc/pdf_strato.modules.php
index f8b7908654b..3c7c74d0362 100644
--- a/htdocs/core/modules/contract/doc/pdf_strato.modules.php
+++ b/htdocs/core/modules/contract/doc/pdf_strato.modules.php
@@ -343,7 +343,7 @@ class pdf_strato extends ModelePDFContract
 						}
 
 						$txtpredefinedservice = '';
-                        $txtpredefinedservice = $objectligne->product_label;
+                        $txtpredefinedservice = $objectligne->product_ref;
                         if ($objectligne->product_label)
                         {
                         	$txtpredefinedservice .= ' - ';