diff --git a/Modules/VMware.VMC.NSXT/VMware.VMC.NSXT.psm1 b/Modules/VMware.VMC.NSXT/VMware.VMC.NSXT.psm1
index 8e372a0..6a55445 100644
--- a/Modules/VMware.VMC.NSXT/VMware.VMC.NSXT.psm1
+++ b/Modules/VMware.VMC.NSXT/VMware.VMC.NSXT.psm1
@@ -477,7 +477,7 @@ 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,