diff --git a/package.json b/package.json
index ee8820bc..1bf7db68 100644
--- a/package.json
+++ b/package.json
@@ -34,6 +34,6 @@
     "test": "node test",
     "bench": "node test --bench",
     "build": "uglifyjs lib/marked.js -cm  --comments /Copyright/ -o marked.min.js",
-    "preversion": "npm run build"
+    "preversion": "npm run build && (git diff --quiet || git commit -am 'minify')"
   }
 }