diff --git a/package-overrides/npm/mocha@1.21.4 b/package-overrides/npm/mocha@1.21.4
new file mode 100644
index 0000000..a4f304a
--- /dev/null
+++ b/package-overrides/npm/mocha@1.21.4
@@ -0,0 +1,15 @@
+{
+  "browser": "mocha",
+  "shim": {
+    "mocha": {
+      "deps": ["./mocha.css!"],
+      "exports": "mocha"
+    }
+  },
+  "jspm": {
+    "dependencies": {
+      "css": "*"
+    },
+    "registry": "jspm"
+  }
+}