diff --git a/appveyor.yml b/appveyor.yml
index 63ba157..e3d66de 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -10,6 +10,7 @@ install:
   - ps: Install-Product node 6 x64
   - git reset --hard HEAD
   - npm install npm -g
+  - npm install -g grunt
   - npm install electron-builder@next # force install next version to test electron-builder
   - npm install
   - npm prune