diff --git a/react-packager/src/Bundler/Bundle.js b/react-packager/src/Bundler/Bundle.js
index 4f54e3be..f02127f3 100644
--- a/react-packager/src/Bundler/Bundle.js
+++ b/react-packager/src/Bundler/Bundle.js
@@ -341,14 +341,11 @@ class Bundle extends BundleBase {
   }
 
   toJSON() {
-    if (!this._finalized) {
-      throw new Error('Cannot serialize bundle unless finalized');
-    }
+    this.assertFinalized('Cannot serialize bundle unless finalized');
 
     return {
       ...super.toJSON(),
       sourceMapUrl: this._sourceMapUrl,
-      mainModuleId: super.getMainModuleId(),
       numPrependedModules: this._numPrependedModules,
       numRequireCalls: this._numRequireCalls,
     };
diff --git a/react-packager/src/Bundler/BundleBase.js b/react-packager/src/Bundler/BundleBase.js
index 635f87e7..b9e1cbe3 100644
--- a/react-packager/src/Bundler/BundleBase.js
+++ b/react-packager/src/Bundler/BundleBase.js
@@ -16,6 +16,7 @@ class BundleBase {
     this._finalized = false;
     this._modules = [];
     this._assets = [];
+    this._mainModuleId = this._mainModuleName = undefined;
   }
 
   getMainModuleId() {
@@ -26,6 +27,14 @@ class BundleBase {
     this._mainModuleId = moduleId;
   }
 
+  getMainModuleName() {
+    return this._mainModuleName;
+  }
+
+  setMainModuleName(moduleName) {
+    this._mainModuleName = moduleName;
+  }
+
   addModule(module) {
     if (!module instanceof ModuleTransport) {
       throw new Error('Expeceted a ModuleTransport object');
@@ -65,9 +74,9 @@ class BundleBase {
     return this._source;
   }
 
-  assertFinalized() {
+  assertFinalized(message) {
     if (!this._finalized) {
-      throw new Error('Bundle needs to be finalized before getting any source');
+      throw new Error(message || 'Bundle needs to be finalized before getting any source');
     }
   }
 
@@ -75,13 +84,16 @@ class BundleBase {
     return {
       modules: this._modules,
       assets: this._assets,
+      mainModuleId: this.getMainModuleId(),
+      mainModuleName: this.getMainModuleName(),
     };
   }
 
   static fromJSON(bundle, json) {
     bundle._assets = json.assets;
     bundle._modules = json.modules;
-    bundle._mainModuleId = json.mainModuleId;
+    bundle.setMainModuleId(json.mainModuleId);
+    bundle.setMainModuleName(json.mainModuleName);
 
     Object.freeze(bundle._modules);
     Object.seal(bundle._modules);
diff --git a/react-packager/src/Bundler/__tests__/Bundle-test.js b/react-packager/src/Bundler/__tests__/Bundle-test.js
index b82f4a6c..5e5fca22 100644
--- a/react-packager/src/Bundler/__tests__/Bundle-test.js
+++ b/react-packager/src/Bundler/__tests__/Bundle-test.js
@@ -311,6 +311,31 @@ describe('Bundle', () => {
       expect(bundle.getEtag()).toEqual(eTag);
     });
   });
+
+  describe('main module name and id:', function() {
+    it('keeps distinct module names and IDs', function() {
+      const id = 'arbitrary module ID';
+      const name = 'arbitrary module name';
+      bundle.setMainModuleId(id);
+      bundle.setMainModuleName(name);
+
+      expect(bundle.getMainModuleId()).toEqual(id);
+      expect(bundle.getMainModuleName()).toEqual(name);
+    });
+
+    it('can serialize and deserialize module ID and name', function() {
+      const id = 'arbitrary module ID';
+      const name = 'arbitrary module name';
+      bundle.setMainModuleId(id);
+      bundle.setMainModuleName(name);
+      bundle.finalize({});
+
+      const deserialized = Bundle.fromJSON(bundle.toJSON());
+
+      expect(deserialized.getMainModuleId()).toEqual(id);
+      expect(deserialized.getMainModuleName()).toEqual(name);
+    });
+  });
 });