diff --git a/htdocs/bom/tpl/objectline_create.tpl.php b/htdocs/bom/tpl/objectline_create.tpl.php
index 3eea9235043..55b14a0f650 100644
--- a/htdocs/bom/tpl/objectline_create.tpl.php
+++ b/htdocs/bom/tpl/objectline_create.tpl.php
@@ -214,7 +214,7 @@ jQuery(document).ready(function() {
 
 	//change unit selected if we change service selected
 	<?php if($filtertype == 1) { ?>
-	$('#idprod:nth-child(2)').change(function(){
+	$('#idprodservice').change(function(){
 			var idproduct = $(this).val();
 			$.ajax({
 				url : "<?php echo dol_buildpath('/bom/ajax/ajax.php',1); ?>"