diff --git a/lib/cartodb/controllers/layergroup.js b/lib/cartodb/controllers/layergroup.js
index 61e5bf85..182fcff5 100644
--- a/lib/cartodb/controllers/layergroup.js
+++ b/lib/cartodb/controllers/layergroup.js
@@ -441,7 +441,7 @@ function getPreviewImageByCenter (previewBackend) {
                 res.set(headers);
             }
 
-            res.set('Content-Type', headers['Content-Type'] || 'image/' + format);
+            res.set('Content-Type', headers['Content-Type'] || `image/${format}`);
 
             res.body = image;
 
@@ -464,7 +464,7 @@ function getPreviewImageByBoundingBox (previewBackend) {
         const { mapConfigProvider: provider } = res.locals;
 
         previewBackend.getImage(provider, format, width, height, bounds, (err, image, headers, stats = {}) => {
-            req.profiler.done('render-' + format);
+            req.profiler.done(`render-${format}`);
             req.profiler.add(stats);
 
             if (err) {
@@ -476,7 +476,7 @@ function getPreviewImageByBoundingBox (previewBackend) {
                 res.set(headers);
             }
 
-            res.set('Content-Type', headers['Content-Type'] || 'image/' + format);
+            res.set('Content-Type', headers['Content-Type'] || `image/${format}`);
 
             res.body = image;
 
@@ -518,7 +518,7 @@ function getAffectedTables (layergroupAffectedTables, pgConnection) {
 
         pgConnection.getConnection(user, (err, connection) => {
             if (err) {
-                global.logger.warn('ERROR generating cache channel: ' + err);
+                global.logger.warn('ERROR generating cache channel:', err);
                 return next();
             }
 
@@ -527,7 +527,7 @@ function getAffectedTables (layergroupAffectedTables, pgConnection) {
                 sql.push(layer.options.sql);
                 if (layer.options.affected_tables) {
                     layer.options.affected_tables.map(function(table) {
-                        sql.push('SELECT * FROM ' + table + ' LIMIT 0');
+                        sql.push(`SELECT * FROM ${table} LIMIT 0`);
                     });
                 }
             });
@@ -535,7 +535,7 @@ function getAffectedTables (layergroupAffectedTables, pgConnection) {
             QueryTables.getAffectedTablesFromQuery(connection, sql.join(';'), (err, affectedTables) => {
                 req.profiler.done('getAffectedTablesFromQuery');
                 if (err) {
-                    global.logger.warn('ERROR generating cache channel: ' + err);
+                    global.logger.warn('ERROR generating cache channel: ', err);
                     return next();
                 }
 
@@ -623,7 +623,7 @@ function tileError () {
         const matches = errMsg.match("(.*) in style 'layer([0-9]+)'");
 
         if (matches) {
-            errMsg = 'style' + matches[2] + ': ' + matches[1];
+            errMsg = `style${matches[2]}: ${matches[1]}`;
         }
 
         err.message = errMsg;