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diff --git a/flake.nix b/flake.nix
index cdcff1f7b1fcd2efa8f0122da5998941ba0aee32..f9c52d0f7d42103274b68ff8a46d7a2c022dd0e1 100644
--- a/flake.nix
+++ b/flake.nix
@@ -58,7 +58,8 @@       config,
       ...
     }: let
       cfg = config.services.ugit;
-      configFile = pkgs.writeText "ugit.yaml" cfg.configFile;
+      yamlFormat = pkgs.formats.yaml {};
+      configFile = pkgs.writeText "ugit.yaml" (builtins.readFile (yamlFormat.generate "ugit-yaml" cfg.config));
       authorizedKeysFile = pkgs.writeText "ugit_keys" (builtins.concatStringsSep "\n" cfg.authorizedKeys);
     in {
       options = with lib; {
@@ -95,9 +96,9 @@             description = "path to host key file (will be created if it doesn't exist)";
             default = "/var/lib/ugit/ugit_ed25519";
           };
 
-          configFile = mkOption {
-            type = types.str;
-            default = "";
+          config = mkOption {
+            type = types.attrs;
+            default = {};
             description = "config.yaml contents";
           };