diff --git a/lib/ble/index.js b/lib/ble/index.js
index 2332fd8..60b1d73 100644
--- a/lib/ble/index.js
+++ b/lib/ble/index.js
@@ -88,8 +88,8 @@ function onWifiWrite (data, offset, withoutResponse, callback) {
 }
 
 function onWifiRead (offset, callback) {
-	const result = bleno.Characteristic.RESULT_SUCCESS
-	const wifiRes = {}
+	let result = bleno.Characteristic.RESULT_SUCCESS
+	let wifiRes = {}
 	let data
 	wifi.list((err, list) => {
 		if (err) {