diff --git a/appveyor.yml b/appveyor.yml
index 814d3b6..1a0acda 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -10,7 +10,7 @@ cache:
 - node_modules
 
 install:
-- Install-Product node 7.9.0
+- ps: Install-Product node 7.9.0
 - npm install
 
 build: off