diff --git a/lib/build.js b/lib/build.js
index 45ddf608..f49e5d91 100644
--- a/lib/build.js
+++ b/lib/build.js
@@ -31,7 +31,7 @@ function haveBabelrc(functionsDir) {
   );
 }
 
-function webpackConfig(dir, {userWebpackConfig, useBabelrc}) {
+function webpackConfig(dir, {userWebpackConfig, useBabelrc} = {}) {
   var config = conf.load();
   var envConfig = conf.loadContext(config).environment;
   var babelOpts = { cacheDirectory: true };
diff --git a/package.json b/package.json
index f9097279..80cd9db9 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "netlify-lambda",
-  "version": "1.4.10",
+  "version": "1.4.11",
   "description": "Build and serve lambda function with webpack compilation",
   "homepage": "https://github.com/netlify/netlify-lambda#readme",
   "main": "bin/cmd.js",