diff --git a/src/index.js b/src/index.js
index fae71c7..cf33008 100644
--- a/src/index.js
+++ b/src/index.js
@@ -26,7 +26,7 @@ class ErrorOverlayPlugin {
         const originalBefore = options.devServer.before
         options.devServer.before = (app, server) => {
           if (originalBefore) {
-            originalBefore(app, server)
+            originalBefore(app, server, compiler)
           }
           app.use(errorOverlayMiddleware())
         }