diff --git a/src/plugin.ts b/src/plugin.ts
index ecb1948..2431461 100644
--- a/src/plugin.ts
+++ b/src/plugin.ts
@@ -160,7 +160,7 @@ export function stencilVitestPlugin(opts: { css?: boolean } = {}): Plugin {
 
         return {
           code: result.code,
-          sourcemap: result.map,
+          map: result.map,
         };
       } catch (err) {
         console.error(`[stencil-vitest-plugin] Failed to transform ${id}:`, err);