diff --git a/bin/install.ps1 b/bin/install.ps1
index 8efc7c785..2464248cb 100644
--- a/bin/install.ps1
+++ b/bin/install.ps1
@@ -56,7 +56,7 @@ shim "$dir\bin\scoop.ps1" $false
 
 ensure_robocopy_in_path
 ensure_scoop_in_path
-scoop config lastupdate [System.DateTime]::Now.ToString('o')
+scoop config lastupdate ([System.DateTime]::Now.ToString('o'))
 success 'Scoop was installed successfully!'
 Write-Output "Type 'scoop help' for instructions."