diff --git a/packages/vite/src/node/plugins/css.ts b/packages/vite/src/node/plugins/css.ts
index 4dc3aa7f158587..aacd6cd0ccf732 100644
--- a/packages/vite/src/node/plugins/css.ts
+++ b/packages/vite/src/node/plugins/css.ts
@@ -380,7 +380,7 @@ export function cssPostPlugin(config: ResolvedConfig): Plugin {
 
         const cssContent = await getContentWithSourcemap(css)
         const devBase = config.base
-        return [
+        const code = [
           `import { updateStyle as __vite__updateStyle, removeStyle as __vite__removeStyle } from ${JSON.stringify(
             path.posix.join(devBase, CLIENT_PUBLIC_PATH)
           )}`,
@@ -394,6 +394,7 @@ export function cssPostPlugin(config: ResolvedConfig): Plugin {
           }`,
           `import.meta.hot.prune(() => __vite__removeStyle(__vite__id))`
         ].join('\n')
+        return { code, map: { mappings: '' } }
       }
 
       // build CSS handling ----------------------------------------------------
diff --git a/playground/css-sourcemap/__tests__/css-sourcemap.spec.ts b/playground/css-sourcemap/__tests__/css-sourcemap.spec.ts
index cee31201cb2f6f..d7e9a5e8ecd71d 100644
--- a/playground/css-sourcemap/__tests__/css-sourcemap.spec.ts
+++ b/playground/css-sourcemap/__tests__/css-sourcemap.spec.ts
@@ -90,6 +90,18 @@ describe.runIf(isServe)('serve', () => {
     `)
   })
 
+  test.runIf(isServe)(
+    'js .css request does not include sourcemap',
+    async () => {
+      const res = await page.request.get(
+        new URL('./linked-with-import.css', page.url()).href
+      )
+      const content = await res.text()
+      const lines = content.trim().split('\n')
+      expect(lines[lines.length - 1]).not.toMatch(/^\/\/#/)
+    }
+  )
+
   test('imported css', async () => {
     const css = await getStyleTagContentIncluding('.imported ')
     const map = extractSourcemap(css)