diff --git a/lib/devices/device.js b/lib/devices/device.js
index 3a6c76a00..041082d3c 100644
--- a/lib/devices/device.js
+++ b/lib/devices/device.js
@@ -36,7 +36,7 @@ Device.prototype.setArgFromCap = function (arg, cap) {
 };
 
 Device.prototype.appString = function () {
-  return this.args.app ? this.args.app.toString().toLowerCase() : '';
+  return this.args.app ? this.args.app.toString() : '';
 };
 
 Device.prototype.configureApp = function (cb) {