diff --git a/build.ps1 b/build.ps1
index 3add422..1e164a5 100644
--- a/build.ps1
+++ b/build.ps1
@@ -385,7 +385,7 @@ else {
 preflight_checks
 
 # Build Packer Boxes
-if ! ($VagrantOnly) {
+if (!($VagrantOnly)) {
   packer_build_box -Box 'windows_2016'
   packer_build_box -Box 'windows_10'
   # Move Packer Boxes