diff --git a/site-modules/vscode/manifests/extention.pp b/site-modules/vscode/manifests/extention.pp
index 82733b8..3bc878e 100644
--- a/site-modules/vscode/manifests/extention.pp
+++ b/site-modules/vscode/manifests/extention.pp
@@ -2,6 +2,7 @@ define vscode::extention {
   exec { "code_install_${title}":
     command  => "code --install-extension ${title}",
     path     => '/usr/bin:/usr/local/bin:/usr/sbin:/bin',
+    unless   => "code --list-extensions | grep ${title}",
     provider => shell,
   }
 }