diff --git a/htdocs/core/js/lib_head.js b/htdocs/core/js/lib_head.js
index 055b4af5a60..dfe656a745e 100644
--- a/htdocs/core/js/lib_head.js
+++ b/htdocs/core/js/lib_head.js
@@ -585,7 +585,7 @@ function cleanSerialize(expr) {
 	var reg = new RegExp("(&)", "g");
 	var reg2 = new RegExp("[^A-Z0-9,]", "g");
 	var liste1 = expr.replace(reg, ",");
-	return liste = liste1.replace(reg2, "");
+	return liste1.replace(reg2, "");
 }