diff --git a/packages/@tailwindcss-node/src/source-maps.test.ts b/packages/@tailwindcss-node/src/source-maps.test.ts
new file mode 100644
index 000000000000..96ff8f05cc5b
--- /dev/null
+++ b/packages/@tailwindcss-node/src/source-maps.test.ts
@@ -0,0 +1,8 @@
+import { expect, it } from 'vitest'
+import { toSourceMap } from './source-maps'
+
+it('should emit source maps', () => {
+  let map = toSourceMap('{"version":3,"sources":[],"names":[],"mappings":""}')
+
+  expect(map.comment('app.css.map')).toBe('/*# sourceMappingURL=app.css.map */\n')
+})
diff --git a/packages/@tailwindcss-node/src/source-maps.ts b/packages/@tailwindcss-node/src/source-maps.ts
index 8810b106c5ef..58b79cb253c3 100644
--- a/packages/@tailwindcss-node/src/source-maps.ts
+++ b/packages/@tailwindcss-node/src/source-maps.ts
@@ -46,7 +46,7 @@ export function toSourceMap(map: DecodedSourceMap | string): SourceMap {
   let raw = typeof map === 'string' ? map : serializeSourceMap(map)
 
   function comment(url: string) {
-    return `/*# sourceMappingURL=${url} */\n`
+    return `/*# sourceMappingURL\x3d${url} */\n`
   }
 
   return {