diff --git a/package.json b/package.json
index 67d88b3..d27d836 100644
--- a/package.json
+++ b/package.json
@@ -28,7 +28,7 @@
     "!*.tsbuildinfo"
   ],
   "scripts": {
-    "build": "tsc -b && tsc -b tsconfig.module.json",
+    "build": "npm run clean && tsc -b && tsc -b tsconfig.module.json",
     "clean": "rimraf lib/ module/",
     "prepublish": "npm run --if-present build",
     "test": "jest",