diff --git a/extensions/css-language-features/extension-browser.webpack.config.js b/extensions/css-language-features/extension-browser.webpack.config.js
index 0cf30ec5dc0..666f4293d6a 100644
--- a/extensions/css-language-features/extension-browser.webpack.config.js
+++ b/extensions/css-language-features/extension-browser.webpack.config.js
@@ -12,7 +12,7 @@ const path = require('path');
 const webpack = require('webpack');
 
 const vscodeNlsReplacement = new webpack.NormalModuleReplacementPlugin(
-	/vscode\-nls\/lib\/main\.js/,
+	/vscode\-nls[\\/]lib[\\/]main\.js/,
 	path.join(__dirname, 'client/out/browser/vscodeNlsShim.js')
 );