diff --git a/appveyor.yml b/appveyor.yml
index b3855e6a4..18f439655 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -8,6 +8,7 @@ install:
 - ps: (new-object Net.WebClient).DownloadString("https://raw.github.com/madskristensen/ExtensionScripts/master/AppVeyor/vsix.ps1") | iex
 - cmd: powershell -NoProfile -ExecutionPolicy unrestricted -Command "&{iex ((new-object net.webclient).DownloadString('https://raw.githubusercontent.com/aspnet/Home/dev/dnvminstall.ps1'))}"
 - cmd: npm install bower -g
+- cmd: npm install gulp -g
 before_build:
 - cd SimpleIdentityServer\VNEXT
 - cmd: dnvm upgrade