diff --git a/types/zeit__next-source-maps/index.d.ts b/types/zeit__next-source-maps/index.d.ts
index 46b3927d97..bdeb4bdfe4 100644
--- a/types/zeit__next-source-maps/index.d.ts
+++ b/types/zeit__next-source-maps/index.d.ts
@@ -7,7 +7,6 @@
 import { ServerConfig } from 'next';
 
 declare function withSourceMaps(
-    /** @default {} */
     nextConfig?: ServerConfig
 ): ServerConfig;