diff --git a/modules/tor.nix b/modules/tor.nix
index 2569004..9c72e01 100644
--- a/modules/tor.nix
+++ b/modules/tor.nix
@@ -671,7 +671,7 @@ in
              version = mkOption {
                default = null;
                description = "If configured, the hidden service uses version 3";
-               type = types.nullOr (types.addCheck types.int (x: x == 2 || x == 3));
+               type = types.nullOr (types.enum [ 2 3 ]);
              };
           };