diff --git a/types/webpack-dev-middleware/index.d.ts b/types/webpack-dev-middleware/index.d.ts
index 8def9015dc..981cdde877 100644
--- a/types/webpack-dev-middleware/index.d.ts
+++ b/types/webpack-dev-middleware/index.d.ts
@@ -62,7 +62,7 @@ declare namespace WebpackDevMiddleware {
          */
         mimeTypes?: MimeTypeMap | OverrideMimeTypeMap | null;
         /** The public path that the middleware is bound to */
-        publicPath: string;
+        publicPath?: string;
         /** Allows users to provide a custom reporter to handle logging within the module */
         reporter?: Reporter | null;
         /** Instructs the module to enable or disable the server-side rendering mode */
diff --git a/types/webpack-dev-middleware/webpack-dev-middleware-tests.ts b/types/webpack-dev-middleware/webpack-dev-middleware-tests.ts
index 9e8ee1d11b..a3a84e6624 100644
--- a/types/webpack-dev-middleware/webpack-dev-middleware-tests.ts
+++ b/types/webpack-dev-middleware/webpack-dev-middleware-tests.ts
@@ -3,9 +3,16 @@ import webpack = require('webpack');
 import webpackDevMiddleware = require('webpack-dev-middleware');
 
 const compiler = webpack({});
+const compilerWithPublicPath = webpack({
+    output: {
+        publicPath: '/assets/'
+    }
+});
 
 let webpackDevMiddlewareInstance = webpackDevMiddleware(compiler);
 
+webpackDevMiddlewareInstance = webpackDevMiddleware(compilerWithPublicPath, {});
+
 webpackDevMiddlewareInstance = webpackDevMiddleware(compiler, {
     logLevel: 'silent',
     logTime: true,