diff --git a/Gruntfile.js b/Gruntfile.js
index d858e4ed..6cb76731 100755
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -95,7 +95,7 @@ module.exports = function (grunt) { // eslint-disable-line
 
 		mocha_phantomjs: { // eslint-disable-line camelcase
 			test: {
-				src: ["test/index.html"],
+				src: ["test/index.html", "tests/index.html"],
 				options: {
 					reporter: "dot"
 				}
diff --git a/tests/index.html b/tests/index.html
index 9d7f08f4..1478c0f6 100644
--- a/tests/index.html
+++ b/tests/index.html
@@ -4,5 +4,11 @@
 <script src="mock.js"></script>
 <script src="../mithril.js"></script>
 <script src="mithril-tests.js"></script>
+<script>
+// shim for running the old test suite with grunt-mocha-phantomjs like the new one
+if ('callPhantom' in window) {
+    window.callPhantom({ testRunEnded: 1})
+}
+</script>
 
 <p>Open the console to see the test report</p>