diff --git a/assets/js/common/pageTitle.js b/assets/js/common/pageTitle.js
index 29d14280..26cd156a 100644
--- a/assets/js/common/pageTitle.js
+++ b/assets/js/common/pageTitle.js
@@ -40,7 +40,7 @@ ComunicWeb.common.pageTitle = {
 	 * Refresh document title
 	 */
 	__refresh: function(){
-		let title = "";
+		var title = "";
 
 		if(this._curr_notifications_number > 0)
 			title += "(" + this._curr_notifications_number + ") ";
diff --git a/assets/js/common/utils.js b/assets/js/common/utils.js
index cd6d578d..c29150d4 100644
--- a/assets/js/common/utils.js
+++ b/assets/js/common/utils.js
@@ -633,7 +633,7 @@ function removeJavascriptEventsFromHTML(html){
 
 	//Search for unexceptable references
 	while(html.match(/on[a-zA-Z ]+=/i) != null){
-		let match = html.match(/on[a-zA-Z ]+=/i)[0];
+		var match = html.match(/on[a-zA-Z ]+=/i)[0];
 		html = html.replace(match, match.replace("on", "o<block></block>n"))
 	}
 
diff --git a/assets/js/components/emoji/picker.js b/assets/js/components/emoji/picker.js
index 9185f522..2b10f219 100644
--- a/assets/js/components/emoji/picker.js
+++ b/assets/js/components/emoji/picker.js
@@ -123,7 +123,7 @@ ComunicWeb.components.emoji.picker = {
 
 		ComunicWeb.components.emoji.picker.addPicker(input);
 
-		let interval = setInterval(() => {
+		var interval = setInterval(function(){
 			
 			//Check if input has been detached
 			if(!input.isConnected){
@@ -133,7 +133,7 @@ ComunicWeb.components.emoji.picker = {
 			
 			//Securely send value to callback
 			if(input.value.length > 0){
-				let value = input.value;
+				var value = input.value;
 				input.value = "";
 				callback(value);
 			}
diff --git a/assets/js/components/notifications/service.js b/assets/js/components/notifications/service.js
index d046f2bd..8f8e46f3 100644
--- a/assets/js/components/notifications/service.js
+++ b/assets/js/components/notifications/service.js
@@ -24,18 +24,18 @@ ComunicWeb.components.notifications.service = {
 	init: function(target, auto_hide, target_conversations){
 
 		//Initialize interval
-		var interval = setInterval(() => {
+		var interval = setInterval(function(){
 
 			//Auto-remove interval if the target has been removed
 			if(!target.isConnected){
 				ComunicWeb.common.pageTitle.setNotificationsNumber(0);
-				this.last_notifs_number = -1;
+				ComunicWeb.components.notifications.service.last_notifs_number = -1;
 				return clearInterval(interval);
 			}
 				
 
 			//Get the number of notifications from the API
-			ComunicWeb.components.notifications.interface.getAllUnread(response => {
+			ComunicWeb.components.notifications.interface.getAllUnread(function(response){
 
 				//Continue in case of success
 				if(response.error)
@@ -65,16 +65,17 @@ ComunicWeb.components.notifications.service = {
 				}
 
 				//Sum notification number
-				let total_number_notifs = response.notifications + response.conversations;
+				var total_number_notifs = response.notifications + response.conversations;
 
 				//Update page title too
 				ComunicWeb.common.pageTitle.setNotificationsNumber(total_number_notifs);
 
 				//Play song if required
-				if(this.last_notifs_number != -1 && total_number_notifs > this.last_notifs_number)
+				if(ComunicWeb.components.notifications.service.last_notifs_number != -1 
+					&& total_number_notifs > ComunicWeb.components.notifications.service.last_notifs_number)
 					ComunicWeb.components.notifications.song.play();
 				
-				this.last_notifs_number = total_number_notifs;
+					ComunicWeb.components.notifications.service.last_notifs_number = total_number_notifs;
 			});
 
 		}, 2000);
diff --git a/assets/js/components/posts/form.js b/assets/js/components/posts/form.js
index 26b10a9b..39741e37 100644
--- a/assets/js/components/posts/form.js
+++ b/assets/js/components/posts/form.js
@@ -75,7 +75,7 @@ ComunicWeb.components.posts.form = {
 		});
 
 		//Enable emojies picker
-		ComunicWeb.components.emoji.picker.addDetachedPicker(newPostMessageContener, (emojie) => {
+		ComunicWeb.components.emoji.picker.addDetachedPicker(newPostMessageContener, function(emojie){
 			
 			//Append new emojie to the instance
 			sceditor.instance(inputMessageTextarea).insertText(emojie);
diff --git a/assets/js/pages/groups/pages/main.js b/assets/js/pages/groups/pages/main.js
index 936e93b2..ac137ae6 100644
--- a/assets/js/pages/groups/pages/main.js
+++ b/assets/js/pages/groups/pages/main.js
@@ -88,9 +88,9 @@ ComunicWeb.pages.groups.pages.main = {
         
         var has_group = false;
 
-        for (const i in list) {
+        for (var i in list) {
             if (list.hasOwnProperty(i)) {
-                const group = list[i];
+                var group = list[i];
                 has_group = true;
                 ComunicWeb.pages.groups.pages.main._display_group(group, target);
             }