diff --git a/nixos/modules/profiles/nix-builder-vm.nix b/nixos/modules/profiles/nix-builder-vm.nix
index 287ae83f498e..67a134cb95fa 100644
--- a/nixos/modules/profiles/nix-builder-vm.nix
+++ b/nixos/modules/profiles/nix-builder-vm.nix
@@ -85,7 +85,7 @@ in
     };
     hostPort = mkOption {
       default = 31022;
-      type = types.int;
+      type = types.port;
       example = 22;
       description = ''
         The localhost host port to forward TCP to the guest port.