diff --git a/htdocs/projet/tasks/time.php b/htdocs/projet/tasks/time.php
index 93ef6997fd4..4f3b1395704 100644
--- a/htdocs/projet/tasks/time.php
+++ b/htdocs/projet/tasks/time.php
@@ -36,6 +36,7 @@ require '../../main.inc.php';
 require_once DOL_DOCUMENT_ROOT . '/projet/class/project.class.php';
 require_once DOL_DOCUMENT_ROOT . '/projet/class/task.class.php';
 require_once DOL_DOCUMENT_ROOT . '/compta/facture/class/facture.class.php';
+require_once DOL_DOCUMENT_ROOT . '/product/class/product.class.php';
 require_once DOL_DOCUMENT_ROOT . '/core/lib/project.lib.php';
 require_once DOL_DOCUMENT_ROOT . '/core/lib/date.lib.php';
 require_once DOL_DOCUMENT_ROOT . '/core/class/html.formother.class.php';
@@ -563,8 +564,11 @@ if ($action == 'confirm_generateinvoice') {
 							$idprodline = $fk_product;
 						}
 
-						// Add lines
-						$lineid = $tmpinvoice->addline($langs->trans("TimeSpentForInvoice", $username) . ' : ' . $qtyhourtext, $pu_htline, round($qtyhour / $prodDurationHours, 2), $txtvaline, $localtax1line, $localtax2line, ($idprodline > 0 ? $idprodline : 0), $remiseproject);
+						// Add lines. Pass type=1 (service) explicitly so the invoice line is tagged
+						// as a service even when no product is bound to the time entry. Otherwise
+						// the default $type=0 leaks through and the PDF labels the operation as
+						// "Delivery of goods" instead of "Provision of services" (issue #34571).
+						$lineid = $tmpinvoice->addline($langs->trans("TimeSpentForInvoice", $username) . ' : ' . $qtyhourtext, $pu_htline, round($qtyhour / $prodDurationHours, 2), $txtvaline, $localtax1line, $localtax2line, ($idprodline > 0 ? $idprodline : 0), $remiseproject, '', '', 0, 0, '', 'HT', 0, Product::TYPE_SERVICE);
 						if ($lineid < 0) {
 							$error++;
 							setEventMessages(null, $tmpinvoice->errors, 'errors');
@@ -663,7 +667,11 @@ if ($action == 'confirm_generateinvoice') {
 						}
 						$idprodline = $value['fk_product'];
 					}
-					$lineid = $tmpinvoice->addline($value['note'], $pu_htline, round($qtyhour / $prodDurationHours, 2), $txtvaline, $localtax1line, $localtax2line, ($idprodline > 0 ? $idprodline : 0), $remiseproject);
+					// Pass type=1 (service) explicitly so the invoice line is tagged as a service
+					// even when no product is bound to the time entry. Otherwise the default
+					// $type=0 leaks through and the PDF labels the operation as
+					// "Delivery of goods" instead of "Provision of services" (issue #34571).
+					$lineid = $tmpinvoice->addline($value['note'], $pu_htline, round($qtyhour / $prodDurationHours, 2), $txtvaline, $localtax1line, $localtax2line, ($idprodline > 0 ? $idprodline : 0), $remiseproject, '', '', 0, 0, '', 'HT', 0, Product::TYPE_SERVICE);
 					if ($lineid < 0) {
 						$error++;
 						setEventMessages(null, $tmpinvoice->errors, 'errors');