diff --git a/htdocs/accountancy/class/accountancyexport.class.php b/htdocs/accountancy/class/accountancyexport.class.php
index d986e5c0d56..472f5b5ce38 100644
--- a/htdocs/accountancy/class/accountancyexport.class.php
+++ b/htdocs/accountancy/class/accountancyexport.class.php
@@ -966,7 +966,7 @@ class AccountancyExport
 
 			// We need to keep the 10 lastest number of invoice doc_ref not the beginning part that is the unusefull almost same part
 			// $tab['num_piece3'] = str_pad(self::trunc($line->piece_num, 10), 10);
-			$tab['num_piece3'] = substr(self::trunc($line->doc_ref, 20), -10);
+			$tab['num_piece3'] = str_pad(substr(self::trunc($line->doc_ref, 20), -10), 10);
 			$tab['reserved'] = str_repeat(' ', 10); // position 159
 			$tab['currency_amount'] = str_repeat(' ', 13); // position 169
 			// get document file