diff --git a/packages/@vue/cli-service/types/ProjectOptions.d.ts b/packages/@vue/cli-service/types/ProjectOptions.d.ts
index 8dc81eaf8b..d49ab202cf 100644
--- a/packages/@vue/cli-service/types/ProjectOptions.d.ts
+++ b/packages/@vue/cli-service/types/ProjectOptions.d.ts
@@ -13,6 +13,7 @@ interface PageConfig {
 interface LoaderOptions {
   css?: object;
   sass?: object;
+  scss?: object;
   less?: object;
   stylus?: object;
   postcss?: object;