diff --git a/htdocs/core/js/lib_head.js.php b/htdocs/core/js/lib_head.js.php
index 83a161e35d6..c0d4f0f3829 100644
--- a/htdocs/core/js/lib_head.js.php
+++ b/htdocs/core/js/lib_head.js.php
@@ -530,7 +530,7 @@ function hideMessage(fieldId,message) {
  * @param   string  token       Token
  */
 function setConstant(url, code, input, entity, strict, forcereload, userid, token) {
-	var $url = url; /* avoid undefined url */
+	var saved_url = url; /* avoid undefined url */
 	$.post( url, {
 		action: "set",
 		name: code,
@@ -575,7 +575,7 @@ function setConstant(url, code, input, entity, strict, forcereload, userid, toke
 				$.each(data, function(key, value) {
 					$("#set_" + key).hide();
 					$("#del_" + key).show();
-					$.post( url, {
+					$.post( saved_url, {
 						action: "set",
 						name: key,
 						value: value,
@@ -605,7 +605,7 @@ function setConstant(url, code, input, entity, strict, forcereload, userid, toke
  * @param   string  token       Token
  */
 function delConstant(url, code, input, entity, strict, forcereload, userid, token) {
-	var $url = url; /* avoid undefined url */
+	var saved_url = url; /* avoid undefined url */
 	$.post( url, {
 		action: "del",
 		name: code,
@@ -647,7 +647,7 @@ function delConstant(url, code, input, entity, strict, forcereload, userid, toke
 				$.each(data, function(key, value) {
 					$("#del_" + value).hide();
 					$("#set_" + value).show();
-					$.post( url, {
+					$.post( saved_url, {
 						action: "del",
 						name: value,
 						entity: entity,