diff --git a/.travis.yml b/.travis.yml
index 794a929..df5c401 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,3 +4,5 @@ node_js:
   - "node"
   - "4"
   - "0.12"
+before_script:
+  - export DISPLAY=:99.0; sh -e /etc/init.d/xvfb start
diff --git a/lib/client/websocket-tracker.js b/lib/client/websocket-tracker.js
index e9944d0..d3a0e21 100644
--- a/lib/client/websocket-tracker.js
+++ b/lib/client/websocket-tracker.js
@@ -90,7 +90,7 @@ WebSocketTracker.prototype.destroy = function (cb) {
   clearTimeout(self.reconnectTimer)
 
   // Destroy peers
-  for(var peerId in self.peers) {
+  for (var peerId in self.peers) {
     var peer = self.peers[peerId]
     clearTimeout(peer.trackerTimeout)
     peer.destroy()