diff --git a/packages/mocker/src/registry.ts b/packages/mocker/src/registry.ts
index 057555d61..0bd4a3972 100644
--- a/packages/mocker/src/registry.ts
+++ b/packages/mocker/src/registry.ts
@@ -174,8 +174,8 @@ export class AutomockedModule {
     public url: string,
   ) {}
 
-  static fromJSON(data: AutomockedModuleSerialized): AutospiedModule {
-    return new AutospiedModule(data.raw, data.id, data.url)
+  static fromJSON(data: AutomockedModuleSerialized): AutomockedModule {
+    return new AutomockedModule(data.raw, data.id, data.url)
   }
 
   toJSON(): AutomockedModuleSerialized {
diff --git a/test/browser/fixtures/mocking/automocked-default-return.test.ts b/test/browser/fixtures/mocking/automocked-default-return.test.ts
new file mode 100644
index 000000000..a28ff8f01
--- /dev/null
+++ b/test/browser/fixtures/mocking/automocked-default-return.test.ts
@@ -0,0 +1,8 @@
+import { expect, test, vi } from 'vitest'
+import { calculator } from './src/calculator'
+
+vi.mock('./src/calculator')
+
+test('returns undefined without mock implementation', () => {
+  expect(calculator('plus', 1, 2)).toBeUndefined()
+})
diff --git a/test/browser/specs/mocking.test.ts b/test/browser/specs/mocking.test.ts
index 688b19f7f..812ba2f3a 100644
--- a/test/browser/specs/mocking.test.ts
+++ b/test/browser/specs/mocking.test.ts
@@ -19,6 +19,7 @@ test.each([true/* , false */])('mocking works correctly - isolated %s', async (i
 
   instances.forEach(({ browser }) => {
     expect(result.stdout).toReportPassedTest('automocked.test.ts', browser)
+    expect(result.stdout).toReportPassedTest('automocked-default-return.test.ts', browser)
     expect(result.stdout).toReportPassedTest('mocked-__mocks__.test.ts', browser)
     expect(result.stdout).toReportPassedTest('mocked-factory.test.ts', browser)
     expect(result.stdout).toReportPassedTest('mocked-factory-hoisted.test.ts', browser)
diff --git a/test/cli/fixtures/mocker/autospy/index.js b/test/cli/fixtures/mocker/autospy/index.js
index 062ff7340..cfa64afb5 100644
--- a/test/cli/fixtures/mocker/autospy/index.js
+++ b/test/cli/fixtures/mocker/autospy/index.js
@@ -1,7 +1,7 @@
 import { mocker } from 'virtual:mocker'
 import { calculate } from './test'
 
-mocker.customMock(import('./test'))
+mocker.customMock(import('./test'), { spy: true })
 
 document.querySelector('#mocked').textContent = calculate(1, 2)