diff --git a/src/fake-luxon.ts b/src/fake-luxon.ts
new file mode 100644
index 00000000..42b1a6fd
--- /dev/null
+++ b/src/fake-luxon.ts
@@ -0,0 +1,5 @@
+export const DateTime = {
+  fromJSDate() {
+    throw new TypeError();
+  }
+};
diff --git a/webpack.config.js b/webpack.config.js
index 42e04419..a764dd9f 100644
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -54,9 +54,9 @@ const rruleConfig = Object.assign({
     rrule: path.join(paths.source, "index.ts"),
     'rrule.min': path.join(paths.source, "index.ts")
   },
-  externals: {
-    luxon: 'luxon'
-  },
+  plugins: [
+    new webpack.NormalModuleReplacementPlugin(/^luxon$/, './fake-luxon.ts'),
+  ]
 }, commonConfig);
 
 const rruleWithLuxonConfig = Object.assign({