diff --git a/packager/react-packager/src/ModuleGraph/output/__tests__/util-test.js b/packager/react-packager/src/ModuleGraph/output/__tests__/util-test.js
index 5704a90f3..6984b76f3 100644
--- a/packager/react-packager/src/ModuleGraph/output/__tests__/util-test.js
+++ b/packager/react-packager/src/ModuleGraph/output/__tests__/util-test.js
@@ -40,13 +40,13 @@ describe('`addModuleIdsToModuleWrapper`:', () => {
       .withArgs(match({path: dependencies[1].path})).returns(6);
 
     expect(addModuleIdsToModuleWrapper(module, idForPath))
-      .toEqual('__d(function(){}, 12, [345, 6]);');
+      .toEqual('__d(function(){},12,[345,6]);');
   });
 
   it('omits the array of dependency IDs if it is empty', () => {
     const module = createModule();
     expect(addModuleIdsToModuleWrapper(module, () => 98))
-      .toEqual(`__d(function(){}, ${98});`);
+      .toEqual(`__d(function(){},${98});`);
   });
 });
 
diff --git a/packager/react-packager/src/ModuleGraph/output/util.js b/packager/react-packager/src/ModuleGraph/output/util.js
index d883a748d..23065d245 100644
--- a/packager/react-packager/src/ModuleGraph/output/util.js
+++ b/packager/react-packager/src/ModuleGraph/output/util.js
@@ -26,11 +26,19 @@ exports.addModuleIdsToModuleWrapper = (
   const {dependencies, file} = module;
   const {code} = file;
   const index = code.lastIndexOf(')');
+
+  // calling `idForPath` on the module itself first gives us a lower module id
+  // for the file itself than for its dependencies. That reflects their order
+  // in the bundle.
+  const fileId = idForPath(file);
+
+  // This code runs for both development and production builds, after
+  // minification. That's why we leave out all spaces.
   const depencyIds =
-    dependencies.length ? `, [${dependencies.map(idForPath).join(', ')}]` : '';
+    dependencies.length ? `,[${dependencies.map(idForPath).join(',')}]` : '';
   return (
     code.slice(0, index) +
-    `, ${idForPath(file)}` +
+    `,${fileId}` +
     depencyIds +
     code.slice(index)
   );