diff --git a/Gruntfile.js b/Gruntfile.js
index 4108a1f18..082bf28c8 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -4,12 +4,16 @@ module.exports = function( grunt ) {
 	function readOptionalJSON( filepath ) {
 		var data = {};
 		try {
-			data = grunt.file.readJSON( filepath );
+			data = JSON.parse( stripJSONComments(
+				fs.readFileSync( filepath, { encoding: "utf8" } )
+			) );
 		} catch ( e ) {}
 		return data;
 	}
 
-	var gzip = require( "gzip-js" ),
+	var fs = require( "fs" ),
+		stripJSONComments = require( "strip-json-comments" ),
+		gzip = require( "gzip-js" ),
 		srcHintOptions = readOptionalJSON( "src/.jshintrc" );
 
 	// The concatenated file won't pass onevar
diff --git a/package.json b/package.json
index 521cbe1ec..eb6c27f49 100644
--- a/package.json
+++ b/package.json
@@ -45,6 +45,7 @@
     "requirejs": "2.1.17",
     "sinon": "1.12.2",
     "sizzle": "2.2.0",
+    "strip-json-comments": "1.0.3",
     "testswarm": "1.1.0"
   },
   "scripts": {
diff --git a/src/.jshintrc b/src/.jshintrc
index d0445ba77..87dcde1cd 100644
--- a/src/.jshintrc
+++ b/src/.jshintrc
@@ -12,6 +12,9 @@
 
 	"sub": true,
 
+	// Support: IE < 10, Android < 4.1
+	// The above browsers are failing a lot of tests in the ES5
+	// test suite at http://test262.ecmascript.org.
 	"es3": true,
 	"browser": true,
 	"wsh": true,