diff --git a/htdocs/takepos/invoice.php b/htdocs/takepos/invoice.php
index 48b481770ac65..74774a41617ad 100644
--- a/htdocs/takepos/invoice.php
+++ b/htdocs/takepos/invoice.php
@@ -151,8 +151,8 @@ function fail($message)
 }
 
 // Assign a default project, if relevant
-if (isModEnabled('project') && !empty(getDolGlobalString("CASHDESK_ID_PROJECT".$takeposterminal))) {
-	$invoice->fk_project = (int) getDolGlobalString("CASHDESK_ID_PROJECT".$takeposterminal);
+if (isModEnabled('project') && getDolGlobalInt("CASHDESK_ID_PROJECT".$takeposterminal)) {
+	$invoice->fk_project = getDolGlobalInt("CASHDESK_ID_PROJECT".$takeposterminal);
 }
 
 // Change the currency of invoice if it was modified