diff --git a/base/network.nix b/base/network.nix
index edd4275..4559340 100644
--- a/base/network.nix
+++ b/base/network.nix
@@ -23,7 +23,7 @@ in
       example = "resolve";
     };
 
-    enableTSExitNode = {
+    enableTSExitNode = mkOption {
       type = types.bool;
       default = false;
       description = "Set up this host as a Tailscale exit node";