diff --git a/.gitignore b/.gitignore
index 386c235..afb5f62 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,3 +6,4 @@ sftp-config.json
 *.sublime-workspace
 .idea
 .vscode
+node_modules
diff --git a/library.js b/library.js
index 2a45c43..4455671 100644
--- a/library.js
+++ b/library.js
@@ -1,6 +1,6 @@
 'use strict';
 
-var S = require.main.require('string');
+var S = require('string');
 var meta = module.parent.require('./meta');
 var user = module.parent.require('./user');
 
@@ -108,7 +108,7 @@ library.addUserToTopic = function(data, callback) {
 			if (err) {
 				return callback(err);
 			}
-			
+
 			data.templateData.loggedInUser = userdata;
 			callback(null, data);
 		});
diff --git a/package.json b/package.json
index 557fed0..eeac291 100644
--- a/package.json
+++ b/package.json
@@ -37,5 +37,8 @@
   "license": "BSD-2-Clause",
   "bugs": {
     "url": "https://github.com/psychobunny/nodebb-theme-persona/issues"
+  },
+  "dependencies": {
+    "string": "^3.3.3"
   }
 }