diff --git a/package.json b/package.json
index 0f3cfa2..712d551 100644
--- a/package.json
+++ b/package.json
@@ -13,7 +13,7 @@
   "scripts": {
     "build": "tsc -p tsconfig.build.json -d",
     "test": "vitest run",
-    "format": "prettier --write 'src/**/*.js'",
+    "format": "prettier --write 'src/**/*.ts'",
     "check-git-clean": "./check-git-clean.sh"
   },
   "dependencies": {