diff --git a/lib/plugins/install/index.js b/lib/plugins/install/index.js
index 03aaa9296..949a47f6f 100644
--- a/lib/plugins/install/index.js
+++ b/lib/plugins/install/index.js
@@ -38,10 +38,10 @@ class Install {
     const repo = {
       owner: parts[1],
       repo: parts[2],
-      branch: 'master'
+      branch: 'master',
     };
 
-    //TODO: Support github tree URLS (branch)
+    // TODO: Support github tree URLS (branch)
     if (~repo.repo.indexOf('#')) {
       repo.repo = url[2].split('#')[0];
       repo.branch = url[2].split('#')[1];
@@ -53,19 +53,18 @@ class Install {
         'https://github.com/serverless/serverless');
     }
 
-    const downloadUrl = 'https://github.com/' + repo.owner + '/' + repo.repo
-      + '/archive/' + repo.branch + '.zip';
+    const downloadUrl = `https://github.com/${repo.owner}/${repo.repo}/archive/${repo.branch}.zip`;
     const servicePath = path.join(process.cwd(), repo.repo);
 
     // Throw error if service path already exists
     if (this.serverless.utils.dirExistsSync(servicePath)) {
-      throw new this.serverless.classes.Error('A folder named \'' + repo.repo + '\' already exists' +
-        ' within the current working directory.');
+      throw new this.serverless.classes.Error(`A folder named \'${repo.repo}\' already exists `
+      + `within the current working directory.`);
     }
 
     // Inform
     this.serverless.cli.log(`Downloading and installing \'${repo.repo}\'...`);
-    let _this = this;
+    const self = this;
 
     // Download service
     return download(
@@ -77,9 +76,9 @@ class Install {
         strip: 1,
         mode: '755',
       })
-      .then(function() {
-        _this.serverless.cli.log(`Successfully installed \'${repo.repo}\'!`);
-      })
+      .then(() => {
+        self.serverless.cli.log(`Successfully installed \'${repo.repo}\'!`);
+      });
   }
 }