diff --git a/webpack.config.ts b/webpack.config.ts
index 341d4c702..a50d6c40c 100644
--- a/webpack.config.ts
+++ b/webpack.config.ts
@@ -196,7 +196,7 @@ module.exports = {
 			}, {
 				loader: 'sass-loader',
 				options: {
-					importer: jsonImporter,
+					importer: jsonImporter(),
 				}
 			}]
 		}, {