diff --git a/apps/documenteditor/mobile/app/controller/Settings.js b/apps/documenteditor/mobile/app/controller/Settings.js
index a6e2aab72..b21d47114 100644
--- a/apps/documenteditor/mobile/app/controller/Settings.js
+++ b/apps/documenteditor/mobile/app/controller/Settings.js
@@ -554,6 +554,9 @@ define([
 
             onShowHelp: function () {
                 var url = '{{HELP_URL}}';
+                if (url.charAt(url.length-1) !== '/') {
+                    url += '/';
+                }
                 if (Common.SharedSettings.get('android')) {
                     url+='mobile-applications/documents/android/index.aspx';
                 } else if (Common.SharedSettings.get('sailfish')) {
diff --git a/apps/presentationeditor/mobile/app/view/Settings.js b/apps/presentationeditor/mobile/app/view/Settings.js
index bf73f44a4..5d8e3a08e 100644
--- a/apps/presentationeditor/mobile/app/view/Settings.js
+++ b/apps/presentationeditor/mobile/app/view/Settings.js
@@ -181,6 +181,9 @@ define([
 
             showHelp: function () {
                 var url = '{{HELP_URL}}';
+                if (url.charAt(url.length-1) !== '/') {
+                    url += '/';
+                }
                 if (Common.SharedSettings.get('android')) {
                     url+='mobile-applications/documents/android/index.aspx';
                 } else if (Common.SharedSettings.get('sailfish')) {
diff --git a/apps/spreadsheeteditor/mobile/app/controller/Settings.js b/apps/spreadsheeteditor/mobile/app/controller/Settings.js
index 67542bfc6..55153f717 100644
--- a/apps/spreadsheeteditor/mobile/app/controller/Settings.js
+++ b/apps/spreadsheeteditor/mobile/app/controller/Settings.js
@@ -113,6 +113,9 @@ define([
                         'page:show' : this.onPageShow
                         , 'settings:showhelp': function(e) {
                             var url = '{{HELP_URL}}';
+                            if (url.charAt(url.length-1) !== '/') {
+                                url += '/';
+                            }
                             if (Common.SharedSettings.get('android')) {
                                 url+='mobile-applications/documents/android/index.aspx';
                             } else if (Common.SharedSettings.get('sailfish')) {
diff --git a/build/Gruntfile.js b/build/Gruntfile.js
index 37c317e18..6cf6ff6a0 100644
--- a/build/Gruntfile.js
+++ b/build/Gruntfile.js
@@ -43,6 +43,9 @@ module.exports = function(grunt) {
                 }, {
                     from: /\{\{APP_TITLE_TEXT\}\}/g,
                     to: process.env['APP_TITLE_TEXT'] || 'ONLYOFFICE'
+                }, {
+                    from: /\{\{HELP_URL\}\}/g,
+                    to: process.env['HELP_URL'] || 'https://helpcenter.onlyoffice.com'
                 }];
 
     var helpreplacements = [