diff --git a/packages/language-server/src/types.ts b/packages/language-server/src/types.ts
index 11d80c012d..7cc825c277 100644
--- a/packages/language-server/src/types.ts
+++ b/packages/language-server/src/types.ts
@@ -2,7 +2,7 @@ import { InitializationOptions } from "@volar/language-server";
 
 export type VueInitializationOptions = InitializationOptions & {
 	typescript: {
-		tsdk?: string;
+		tsdk: string;
 	}
 	vue?: {
 		/**