diff --git a/src/loader/index.ts b/src/loader/index.ts
index e63f2ea..3e115bd 100644
--- a/src/loader/index.ts
+++ b/src/loader/index.ts
@@ -126,6 +126,7 @@ export default async function (
       },
       babelConfig: {
         ...loaderOptions.babelConfig,
+        sourceFileName: resourcePath, // Webpack needs absolute file paths in the output sources and does not honor "sourceRoot".
         compact: false,
         comments: false,
         caller: {