diff --git a/htdocs/html.form.class.php b/htdocs/html.form.class.php
index ea4a049581d..50f732d3d08 100644
--- a/htdocs/html.form.class.php
+++ b/htdocs/html.form.class.php
@@ -56,7 +56,7 @@ class Form {
    *
    *
    */
-  Function select_tva($name='', $defaulttx = 0)
+  Function select_tva($name='', $defaulttx = '')
   {
     if (! strlen(trim($name)))
     {
@@ -75,6 +75,11 @@ class Form {
 	$txtva[2] = '0';
       }
 
+    if ($defaulttx == '')
+      {
+	$defaulttx = $txtva[0];
+      }
+
     $taille = sizeof($txtva);
 
     print '<select name="'.$name.'">';