diff --git a/flake.nix b/flake.nix
index 7d62ec0..5b8a3d1 100644
--- a/flake.nix
+++ b/flake.nix
@@ -84,7 +84,7 @@
             default = 1027;
             description = "The UDP port to host the server on";
           };
-          proximity = {
+          proximity = lib.mkOption {
             type = types.nullOr lib.types.attrs;
             default = null;
             port = lib.mkOption {