diff --git a/src/packager/lib/deep-clone.js b/src/packager/lib/deep-clone.js
new file mode 100644
index 0000000..b40b88f
--- /dev/null
+++ b/src/packager/lib/deep-clone.js
@@ -0,0 +1,24 @@
+const deepClone = (obj) => {
+  if (obj instanceof Blob) {
+    return obj;
+  }
+  if (Array.isArray(obj)) {
+    const result = [];
+    for (const value of obj) {
+      result.push(deepClone(value));
+    }
+    return result;
+  }
+  if (obj && typeof obj === 'object') {
+    // TODO: there's probably some prototype pollution in here
+    const result = {};
+    for (const key of Object.keys(obj)) {
+      result[key] = deepClone(obj[key]);
+    }
+    return result;
+  }
+  // Primitive type
+  return obj;
+};
+
+export default deepClone;
diff --git a/src/packager/packager.js b/src/packager/packager.js
index 8add022..d409019 100644
--- a/src/packager/packager.js
+++ b/src/packager/packager.js
@@ -5,6 +5,7 @@ import {readAsArrayBuffer, readAsURL} from './lib/readers';
 import largeAssets from './large-assets';
 import xhr from './lib/xhr';
 import pngToAppleICNS from './lib/icns';
+import deepClone from './lib/deep-clone';
 
 const escapeXML = (v) => v.replace(/["'<>&]/g, (i) => {
   switch (i) {
@@ -54,7 +55,7 @@ class Packager extends EventTarget {
 
   child () {
     const packager = new Packager();
-    packager.options = JSON.parse(JSON.stringify(this.options));
+    packager.options = deepClone(this.options);
     packager.vm = this.vm;
     packager.serialized = this.serialized;
     return packager;