diff --git a/htdocs/includes/modules/facture/pluton/pluton.modules.php b/htdocs/includes/modules/facture/pluton/pluton.modules.php
index 74f3ab8c577..a18b56a9fe8 100644
--- a/htdocs/includes/modules/facture/pluton/pluton.modules.php
+++ b/htdocs/includes/modules/facture/pluton/pluton.modules.php
@@ -226,7 +226,7 @@ function info()
                 $max = $row[0];
             }
         }
-        else if ($conf->global->PROPALE_NUM_DELTA != '' && !eregi('^'.$this->searchLastWithPreviousYear.'',$previousyy))
+        else if ($conf->global->FACTURE_NUM_DELTA != '' && !eregi('^'.$this->searchLastWithPreviousYear.'',$previousyy))
         {
         	// on applique le delta une seule fois
         	$max=$conf->global->FACTURE_NUM_DELTA?$conf->global->FACTURE_NUM_DELTA-1:0;