diff --git a/lib/board.js b/lib/board.js
index ebd2ba5..8738975 100644
--- a/lib/board.js
+++ b/lib/board.js
@@ -77,7 +77,7 @@ util.inherits(Board, events.EventEmitter);
 Board.prototype.detect = function (cb) {
   this.log('info', 'attempting to find Arduino board');
   var self = this;
-  child.exec('ls /dev | grep usb', function(err, stdout, stderr){
+  child.exec('ls /dev | grep -i usb', function(err, stdout, stderr){
     var possible = stdout.slice(0, -1).split('\n'),
         found = false;
     for (var i in possible) {