diff --git a/nix/clickhouse/default.nix b/nix/clickhouse/default.nix
index fc8385e5..7f618de7 100644
--- a/nix/clickhouse/default.nix
+++ b/nix/clickhouse/default.nix
@@ -27,6 +27,28 @@ in
       description = "The clickhouse data directory";
     };
 
+    defaultExtraConfig = lib.mkOption {
+      type = yamlFormat.type;
+      internal = true;
+      readOnly = true;
+      default = {
+        logger.level = "warning";
+        logger.console = 1;
+        default_profile = "default";
+        default_database = "default";
+        tcp_port = toString config.port;
+        path = "${config.dataDir}/clickhouse";
+        tmp_path = "${config.dataDir}/clickhouse/tmp";
+        user_files_path = "${config.dataDir}/clickhouse/user_files";
+        format_schema_path = "${config.dataDir}/clickhouse/format_schemas";
+        user_directories = {
+          users_xml = {
+            path = "${config.package}/etc/clickhouse-server/users.xml";
+          };
+        };
+      };
+    };
+
     extraConfig = lib.mkOption {
       type = yamlFormat.type;
       description = "Additional configuration to be appended to `clickhouse-config.yaml`.";
@@ -75,24 +97,7 @@ in
         processes =
           let
             clickhouseConfig = yamlFormat.generate "clickhouse-config.yaml" (
-              {
-                logger = {
-                  level = "warning";
-                  console = 1;
-                };
-                tcp_port = "${toString config.port}";
-                default_profile = "default";
-                default_database = "default";
-                path = "${config.dataDir}/clickhouse";
-                tmp_path = "${config.dataDir}/clickhouse/tmp";
-                user_files_path = "${config.dataDir}/clickhouse/user_files";
-                format_schema_path = "${config.dataDir}/clickhouse/format_schemas";
-                user_directories = {
-                  users_xml = {
-                    path = "${config.package}/etc/clickhouse-server/users.xml";
-                  };
-                };
-              } // config.extraConfig
+              lib.recursiveUpdate config.defaultExtraConfig config.extraConfig
             );
           in
           {