diff --git a/Modules/VMware.VMC.NSXT/VMware.VMC.NSXT.psm1 b/Modules/VMware.VMC.NSXT/VMware.VMC.NSXT.psm1
index b8c9c9a..e250676 100644
--- a/Modules/VMware.VMC.NSXT/VMware.VMC.NSXT.psm1
+++ b/Modules/VMware.VMC.NSXT/VMware.VMC.NSXT.psm1
@@ -469,7 +469,7 @@ Function New-NSXTFirewall {
         [Parameter(Mandatory=$False)]$SourceGroup,
         [Parameter(Mandatory=$False)]$DestinationGroup,
         [Parameter(Mandatory=$True)]$Service,
-        [Parameter(Mandatory=$True)][ValidateSet("ALLOW","DENY")]$Action,
+        [Parameter(Mandatory=$True)][ValidateSet("ALLOW","DROP")]$Action,
         [Parameter(Mandatory=$false)]$InfraScope,
         [Parameter(Mandatory=$false)]$SourceInfraGroup,
         [Parameter(Mandatory=$false)]$DestinationInfraGroup,