diff --git a/htdocs/core/class/discount.class.php b/htdocs/core/class/discount.class.php
index fe792fabd2d..848999b11c6 100644
--- a/htdocs/core/class/discount.class.php
+++ b/htdocs/core/class/discount.class.php
@@ -611,7 +611,7 @@ class DiscountAbsolute
             $sql = 'SELECT sum(rc.amount_ttc) as amount, sum(rc.multicurrency_amount_ttc) as multicurrency_amount';
             $sql .= ' FROM '.MAIN_DB_PREFIX.'societe_remise_except as rc, '.MAIN_DB_PREFIX.'facture_fourn as f';
             $sql .= ' WHERE rc.fk_invoice_supplier_source=f.rowid AND rc.fk_invoice_supplier = '.$invoice->id;
-            $sql .= ' f.type IN (' . Facture::TYPE_STANDARD . ', ' . Facture::TYPE_CREDIT_NOTE . ')'; // Find discount coming from credit note or excess paid
+            $sql .= ' AND f.type IN (' . Facture::TYPE_STANDARD . ', ' . Facture::TYPE_CREDIT_NOTE . ')'; // Find discount coming from credit note or excess paid
         }
         else
         {