diff --git a/package.json b/package.json
index db7be18..12afc24 100644
--- a/package.json
+++ b/package.json
@@ -43,7 +43,7 @@
   },
   "scripts": {
     "test": "mocha test -R spec",
-    "postinstall": "grunt shell"
+    "postinstall": "node_modules/.bin/grunt shell"
   },
   "dependencies": {
     "soop": "git://github.com/bitpay/soop.git",