diff --git a/test/index.html b/test/index.html
index 778dc4dff..013548558 100644
--- a/test/index.html
+++ b/test/index.html
@@ -43,6 +43,12 @@
 	<script src="jquery.js"></script>
 
 	<script>
+
+		// Add Sizzle tests if they not loaded by requirejs
+		if ( window.testSubproject ) {
+			testSubproject( "Sizzle", "../bower_components/sizzle/test/", /^unit\/.*\.js$/ );
+		}
+
 		// html5shiv, enabling HTML5 elements to be used with jQuery
 		( "abbr article aside audio bdi canvas data datalist details figcaption figure footer header hgroup " +
 			"mark meter nav output progress section summary time video"