diff --git a/package.json b/package.json
index 6be2421055..f74573c51f 100644
--- a/package.json
+++ b/package.json
@@ -17,7 +17,7 @@
     "build": "babel src -d lib --source-maps",
     "start": "babel src -w -d lib --source-maps",
     "clean": "rimraf lib",
-    "prepublish": "npm run build; git rev-parse HEAD > git-revision.txt",
+    "prepublish": "npm run build && git rev-parse HEAD > git-revision.txt",
     "test": "karma start --browsers PhantomJS",
     "test-multi": "karma start --single-run=false"
   },