diff --git a/htdocs/compta/tva/quadri_detail.php b/htdocs/compta/tva/quadri_detail.php
index d3c16e10907..c1f89dd3bbc 100644
--- a/htdocs/compta/tva/quadri_detail.php
+++ b/htdocs/compta/tva/quadri_detail.php
@@ -116,7 +116,7 @@ if (empty($min)) {
 
 // Define modetax (0 or 1)
 // 0=normal, 1=option vat for services is on debit, 2=option on payments for products
-$modetax = (!empty($conf->global->TAX_MODE) ? $conf->global->TAX_MODE : 0);
+$modetax = (empty($conf->global->TAX_MODE) ? 0 : $conf->global->TAX_MODE);
 if (GETPOSTISSET("modetax")) {
 	$modetax = GETPOSTINT("modetax");
 }