diff --git a/lib/client/http-tracker.js b/lib/client/http-tracker.js
index 0c677fc..716be4d 100644
--- a/lib/client/http-tracker.js
+++ b/lib/client/http-tracker.js
@@ -92,7 +92,7 @@ HTTPTracker.prototype._request = function (requestUrl, params, cb) {
   var opts = {
     url: u,
     header: {
-      'user-agent': self.client._userAgent || '',
+      'user-agent': self.client._userAgent || ''
     }
   }