diff --git a/lib/install.ps1 b/lib/install.ps1
index d73a5a1af..0259a176b 100644
--- a/lib/install.ps1
+++ b/lib/install.ps1
@@ -814,7 +814,7 @@ function prune_installed($apps, $global) {
 
     $uninstalled = $apps | ? { $installed -notcontains $_ }
 
-    return @(,$uninstalled, $installed)
+    return (,($uninstalled), ($installed))
 }
 
 # check whether the app failed to install