diff --git a/classes/pdf/HTMLTemplateDeliverySlip.php b/classes/pdf/HTMLTemplateDeliverySlip.php
index b5ea014fe..7a3c2cdc5 100755
--- a/classes/pdf/HTMLTemplateDeliverySlip.php
+++ b/classes/pdf/HTMLTemplateDeliverySlip.php
@@ -90,7 +90,7 @@ class HTMLTemplateDeliverySlipCore extends HTMLTemplate
 	 */
 	public function getFilename()
 	{
-		return Configuration::get('PS_DELIVERY_PREFIX', Context::getContext()->language->id, null, $this->order->id_shop).sprintf('%06d', $this->order->invoice_number).'.pdf';
+		return Configuration::get('PS_DELIVERY_PREFIX', Context::getContext()->language->id, null, $this->order->id_shop).sprintf('%06d', $this->order->delivery_number).'.pdf';
 	}
 }