diff --git a/Blob.js b/Blob.js
index 61b9bee..f1204be 100644
--- a/Blob.js
+++ b/Blob.js
@@ -28,7 +28,7 @@
 
 	// Internally we use a BlobBuilder implementation to base Blob off of
 	// in order to support older browsers that only have BlobBuilder
-	var BlobBuilder = view.BlobBuilder || view.WebKitBlobBuilder || view.MozBlobBuilder || view.MSBlobBuilder || (function(view) {
+	var BlobBuilder = view.BlobBuilder || view.WebKitBlobBuilder || view.MozBlobBuilder || (function(view) {
 		var
 			  get_class = function(object) {
 				return Object.prototype.toString.call(object).match(/^\[object\s(.*)\]$/)[1];