diff --git a/package.json b/package.json
index d6185240..a29bfefa 100644
--- a/package.json
+++ b/package.json
@@ -12,7 +12,7 @@
   "scripts": {
     "build": "rm -rf ./.build && babel lib -d .build/lib && babel index.js --out-file .build/index.js && cp package.json ./.build && cp README.md ./.build",
     "build-win": "babel lib -d .build/lib && babel index.js --out-file .build/index.js && copy package.json .build && copy README.md .build",
-    "build-tsc": "tsc && copy package.json .build && copy README.md .build",
+    "build-tsc": "tsc && cp package.json .build && cp README.md .build",
     "test": "jest",
     "lint": "eslint lib/**/*.js test/**/*.js --cache",
     "format": "prettier --single-quote --write ./test/**/*.js ./lib/*.js ./lib/**/*.js",