diff --git a/core/form.js b/core/form.js
index b40def3a..77e8e120 100644
--- a/core/form.js
+++ b/core/form.js
@@ -1,7 +1,7 @@
 function decode(encoded) {
-	var result = "";
-	for (var i = 0; i < encoded.length; i++) {
-		var c = encoded[i];
+	let result = "";
+	for (let i = 0; i < encoded.length; i++) {
+		let c = encoded[i];
 		if (c == "+") {
 			result += " ";
 		} else if (c == "%") {
@@ -15,15 +15,15 @@ function decode(encoded) {
 }
 
 function decodeForm(encoded, initial) {
-	var result = initial || {};
+	let result = initial || {};
 	if (encoded) {
 		encoded = encoded.trim();
-		var items = encoded.split('&');
-		for (var i = 0; i < items.length; i++) {
-			var item = items[i];
-			var equals = item.indexOf('=');
-			var key = decode(item.slice(0, equals));
-			var value = decode(item.slice(equals + 1));
+		let items = encoded.split('&');
+		for (let i = 0; i < items.length; i++) {
+			let item = items[i];
+			let equals = item.indexOf('=');
+			let key = decode(item.slice(0, equals));
+			let value = decode(item.slice(equals + 1));
 			result[key] = value;
 		}
 	}