diff --git a/app.js b/app.js
index 29a849e..5165966 100644
--- a/app.js
+++ b/app.js
@@ -1,3 +1,4 @@
+"use strict";
 var express = require('express');
 var path = require('path');
 var favicon = require('serve-favicon');
diff --git a/bin/www b/bin/www
index 84dbb73..1a8743a 100755
--- a/bin/www
+++ b/bin/www
@@ -1,4 +1,5 @@
 #!/usr/bin/env node
+"use strict";
 var debug = require('debug')('unify.audio');
 var app = require('../app');
 
diff --git a/lib/googleplaymusic.js b/lib/googleplaymusic.js
index 2cc3111..235f76c 100644
--- a/lib/googleplaymusic.js
+++ b/lib/googleplaymusic.js
@@ -1,3 +1,4 @@
+"use strict";
 var parse = require("url").parse;
 var PlayMusic = require('playmusic');
 var pm = new PlayMusic();
diff --git a/lib/rdio.js b/lib/rdio.js
index 7a6b496..95a6d0f 100644
--- a/lib/rdio.js
+++ b/lib/rdio.js
@@ -1,3 +1,4 @@
+"use strict";
 var parse = require('url').parse;
 
 if (!process.env.RDIO_API_KEY || !process.env.RDIO_API_SHARED) {
diff --git a/lib/spotify.js b/lib/spotify.js
index 9ac7d98..7b838a9 100644
--- a/lib/spotify.js
+++ b/lib/spotify.js
@@ -1,3 +1,4 @@
+"use strict";
 var parse = require('url').parse;
 var spotify = require('spotify');
 
diff --git a/routes/index.js b/routes/index.js
index edff907..7d4b5a1 100644
--- a/routes/index.js
+++ b/routes/index.js
@@ -1,3 +1,4 @@
+"use strict";
 var parse = require('url').parse;
 var express = require('express');
 var router = express.Router();
diff --git a/test/test.js b/test/test.js
index 13c2c0a..da3267e 100644
--- a/test/test.js
+++ b/test/test.js
@@ -1,3 +1,4 @@
+"use strict";
 var assert = require("assert");
 var should = require('should');
 var spotify = require("../lib/spotify");