diff --git a/src/main/index.ts b/src/main/index.ts
index 068a24e..66650e8 100644
--- a/src/main/index.ts
+++ b/src/main/index.ts
@@ -17,7 +17,7 @@ function createWindow(): void {
     autoHideMenuBar: true,
     ...(process.platform === 'linux' ? { icon } : {}),
     webPreferences: {
-      preload: join(__dirname, '../preload/index.js'),
+      preload: join(__dirname, '../preload/index.mjs'),
       sandbox: false
     }
   })