diff --git a/modules/default/weather/providers/ukmetoffice.js b/modules/default/weather/providers/ukmetoffice.js
index 54ebed16..d7aa9886 100755
--- a/modules/default/weather/providers/ukmetoffice.js
+++ b/modules/default/weather/providers/ukmetoffice.js
@@ -82,7 +82,7 @@ WeatherProvider.register("ukmetoffice", {
 		let timeInMins = nowUtc.diff(midnightUtc, "minutes");
 
 		// loop round each of the (5) periods, look for today (the first period may be yesterday)
-		for (i in currentWeatherData.SiteRep.DV.Location.Period) {
+		for (var i in currentWeatherData.SiteRep.DV.Location.Period) {
 			let periodDate = moment.utc(currentWeatherData.SiteRep.DV.Location.Period[i].value.substr(0,10), "YYYY-MM-DD");
 
 			// ignore if period is before today
@@ -92,7 +92,7 @@ WeatherProvider.register("ukmetoffice", {
 				if (moment().diff(periodDate, "minutes") > 0) {
 					// loop round the reports looking for the one we are in
 					// $ value specifies the time in minutes-of-the-day: 0, 180, 360,...1260
-					for (j in currentWeatherData.SiteRep.DV.Location.Period[i].Rep){
+					for (var j in currentWeatherData.SiteRep.DV.Location.Period[i].Rep){
 						let p = currentWeatherData.SiteRep.DV.Location.Period[i].Rep[j].$;
 						if (timeInMins >= p && timeInMins-180 < p) {
 							// finally got the one we want, so populate weather object
@@ -126,11 +126,11 @@ WeatherProvider.register("ukmetoffice", {
 
 		// loop round the (5) periods getting the data
 		// for each period array, Day is [0], Night is [1]
-		for (j in forecasts.SiteRep.DV.Location.Period) {
+		for (var j in forecasts.SiteRep.DV.Location.Period) {
 			const weather = new WeatherObject(this.config.units, this.config.tempUnits, this.config.windUnits);
 
 			// data times are always UTC
-			dateStr = forecasts.SiteRep.DV.Location.Period[j].value;
+			const dateStr = forecasts.SiteRep.DV.Location.Period[j].value;
 			let periodDate = moment.utc(dateStr.substr(0,10), "YYYY-MM-DD");
 
 			// ignore if period is before today
diff --git a/tests/configs/modules/positions.js b/tests/configs/modules/positions.js
index d2bf5ee9..1d36a0c0 100644
--- a/tests/configs/modules/positions.js
+++ b/tests/configs/modules/positions.js
@@ -26,7 +26,7 @@ var config = {
 				"middle_center", "lower_third", "bottom_left", "bottom_center", "bottom_right",
 				"bottom_bar", "fullscreen_above", "fullscreen_below"];
 			var modules = Array();
-			for (idx in positions) {
+			for (var idx in positions) {
 				modules.push({
 					module: "helloworld",
 					position: positions[idx],
diff --git a/tests/unit/functions/calendar_spec.js b/tests/unit/functions/calendar_spec.js
index 6e4fe988..8c8df684 100644
--- a/tests/unit/functions/calendar_spec.js
+++ b/tests/unit/functions/calendar_spec.js
@@ -17,7 +17,7 @@ describe("Functions into modules/default/calendar/calendar.js", function() {
 	});
 
 	describe("capFirst", function() {
-		words = {
+		const words = {
 			"rodrigo": "Rodrigo",
 			"123m": "123m",
 			"magic mirror": "Magic mirror",
@@ -89,7 +89,7 @@ describe("Functions into modules/default/calendar/calendar.js", function() {
 	});
 
 	describe("shorten", function() {
-		strings = {
+		const strings = {
 			" String with whitespace at the beginning that needs trimming" : { length: 16, return: "String with whit&hellip;" },
 			"long string that needs shortening": { length: 16, return: "long string that&hellip;" },
 			"short string": { length: 16, return: "short string" },
diff --git a/tests/unit/functions/newsfeed_spec.js b/tests/unit/functions/newsfeed_spec.js
index c6bb34f2..937f57ee 100644
--- a/tests/unit/functions/newsfeed_spec.js
+++ b/tests/unit/functions/newsfeed_spec.js
@@ -12,7 +12,7 @@ describe("Functions into modules/default/newsfeed/newsfeed.js", function() {
 	require("../../../modules/default/newsfeed/newsfeed.js");
 
 	describe("capitalizeFirstLetter", function() {
-		words = {
+		const words = {
 			"rodrigo": "Rodrigo",
 			"123m": "123m",
 			"magic mirror": "Magic mirror",
diff --git a/tests/unit/global_vars/root_path_spec.js b/tests/unit/global_vars/root_path_spec.js
index f5469e80..3f162dfe 100644
--- a/tests/unit/global_vars/root_path_spec.js
+++ b/tests/unit/global_vars/root_path_spec.js
@@ -62,7 +62,7 @@ describe("'global.root_path' set in js/app.js", function() {
 	});
 
 	it("should expect the global.version equals package.json file", function() {
-		versionPackage = JSON.parse(fs.readFileSync("package.json", "utf8")).version;
+		const versionPackage = JSON.parse(fs.readFileSync("package.json", "utf8")).version;
 		expect(this.sandbox.global.version).to.equal(versionPackage);
 	});
 });