diff --git a/flake.nix b/flake.nix
index 7d62ec0..102957a 100644
--- a/flake.nix
+++ b/flake.nix
@@ -32,7 +32,7 @@
           nativeBuildInputs = with pkgs; [pkg-config cmake];
           buildInputs = with pkgs;
             [
-              openssl
+              openssl 
               zlib-ng
             ]
             ++ lib.optionals stdenv.isDarwin [
@@ -84,11 +84,11 @@
             default = 1027;
             description = "The UDP port to host the server on";
           };
-          proximity = {
-            type = types.nullOr lib.types.attrs;
+          proximity = lib.mkOption {
+            type = lib.types.nullOr lib.types.attrs;
             default = null;
             port = lib.mkOption {
-              type = types.nullOr lib.types.port;
+              type = lib.types.port;
               example = 4433;
               description = "The UDP port to host the proximity chat server on";
             };