diff --git a/webpack.config.js b/webpack.config.js
index fb16098ca5..a7df99b395 100644
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -18,6 +18,7 @@ module.exports = {
         // CSS themes
         "theme-light": "./node_modules/matrix-react-sdk/res/themes/light/css/light.scss",
         "theme-dark": "./node_modules/matrix-react-sdk/res/themes/dark/css/dark.scss",
+        "theme-light-custom": "./node_modules/matrix-react-sdk/res/themes/light-custom/css/light-custom.scss",
     },
     module: {
         rules: [