diff --git a/src/inject.ts b/src/inject.ts
index e8ecb1f47..e3fdd478f 100644
--- a/src/inject.ts
+++ b/src/inject.ts
@@ -56,7 +56,7 @@ export default async function inject(
   const generator = new Generator({
     env,
     inputMap,
-    baseUrl: cwdUrl,
+    baseUrl: new URL('.', new URL(htmlFile, `${pathToFileURL(process.cwd())}/`)),
     mapUrl: getInputMapUrl(flags),
     resolutions: getResolutions(flags),
   })