diff --git a/types/webpack-serve/index.d.ts b/types/webpack-serve/index.d.ts
index 8e597097a7..5a1a302af0 100644
--- a/types/webpack-serve/index.d.ts
+++ b/types/webpack-serve/index.d.ts
@@ -16,12 +16,12 @@ export = WebpackServe;
 
 declare module 'webpack' {
   interface Configuration {
-    serve: WebpackServe.Options;
+    serve?: WebpackServe.Options;
   }
 }
 
 declare function WebpackServe(
-  { config }: { config: WebpackServe.Options }
+  { config }: { config: webpack.Configuration }
 ): Promise<WebpackServe.Instance>;
 
 declare namespace WebpackServe {
diff --git a/types/webpack-serve/webpack-serve-tests.ts b/types/webpack-serve/webpack-serve-tests.ts
index fff9668b29..2a29cec317 100644
--- a/types/webpack-serve/webpack-serve-tests.ts
+++ b/types/webpack-serve/webpack-serve-tests.ts
@@ -5,13 +5,15 @@ const compiler = webpack();
 
 const server = serve({
   config: {
-    http2: true,
-    dev: {
-      publicPath: '/',
-      logLevel: 'info'
+    serve: {
+      http2: true,
+      dev: {
+        publicPath: '/',
+        logLevel: 'info'
+      },
+      host: 'localhost'
     },
-    host: 'localhost'
-  }
+  },
 });
 
 server