diff --git a/lib/webpack.js b/lib/webpack.js
index 3feb327c3c5..5dcc0b12904 100644
--- a/lib/webpack.js
+++ b/lib/webpack.js
@@ -53,7 +53,8 @@ webpack.WebpackOptionsApply = WebpackOptionsApply;
 webpack.Compiler = Compiler;
 webpack.MultiCompiler = MultiCompiler;
 webpack.NodeEnvironmentPlugin = NodeEnvironmentPlugin;
-webpack.validate = validateWebpackOptions;
+webpack.validate = validateWebpackOptions.bind(this, webpackOptionsSchema);
+webpack.validateSchema = validateWebpackOptions;
 
 function exportPlugins(exports, path, plugins) {
 	plugins.forEach(function(name) {