diff --git a/webpack.config.ts b/webpack.config.ts
index 599737b8144fa55ef4d26957868e9a690149bba2..a6ce8e24975512e2b126739105b58f1bd2da8e64 100644
--- a/webpack.config.ts
+++ b/webpack.config.ts
@@ -98,7 +98,10 @@ module.exports = {
 			use: [{
 				loader: 'vue-style-loader'
 			}, {
-				loader: 'css-loader'
+				loader: 'css-loader',
+				options: {
+					esModule: false, // TODO: trueにすると壊れる。Vue3移行の折にはtrueにできるかもしれない
+				}
 			}, postcss]
 		}, {
 			test: /\.(eot|woff|woff2|svg|ttf)([?]?.*)$/,