diff --git a/spec/headers_test.js b/spec/headers_test.js
index 8e12d150d76ec4e0f07779bea6695278a4e2a5bf..f2122fd4f66b1d15d73185779dba16b953d26cd1 100644
--- a/spec/headers_test.js
+++ b/spec/headers_test.js
@@ -37,7 +37,7 @@ describe('Responses contain custom headers', function () {
   it('index.html has version', async function () {
     const response = await request(app).get('/index.html')
     expect(response.statusCode).to.equal(200)
-    expect(response.headers.version).to.match(/\d*\.\d*/)
+    expect(response.headers.version).to.equal('3038606729')
   })
 
   it('javascript file contains dependencies', async function () {
diff --git a/src/files.js b/src/files.js
index d7b4af44af9e2dc99bae62500b32a4ed89de7071..e13b56d0d8d18871e8a92c67378fa891a4e5ce8a 100644
--- a/src/files.js
+++ b/src/files.js
@@ -76,7 +76,7 @@ class FileCache {
 
     this._cache = cache
     this._manifests = manifests
-    this._hash = `${+new Date()}.${manifests.__hash__}`
+    this._hash = manifests.__hash__
     this._dependencies = deps
     this._oxManifests = viteToOxManifest(manifests)