diff --git a/packages/misskey-js/tsconfig.json b/packages/misskey-js/tsconfig.json
index 6e34e332e000..f7bbc4730454 100644
--- a/packages/misskey-js/tsconfig.json
+++ b/packages/misskey-js/tsconfig.json
@@ -15,6 +15,7 @@
 		"experimentalDecorators": true,
 		"noImplicitReturns": true,
 		"esModuleInterop": true,
+		"exactOptionalPropertyTypes": true,
 		"typeRoots": [
 			"./node_modules/@types"
 		],