diff --git a/config.cpp b/config.cpp
index c10d454..5bcc46d 100644
--- a/config.cpp
+++ b/config.cpp
@@ -99,7 +99,7 @@ void write_config(const Config& config) {
     std::string tmp_config_file_path = config_file_path + ".tmp";
 
     std::unique_ptr<FILE, decltype(&fclose_and_log)> config_file(fopen_or_raise(tmp_config_file_path.c_str(), "w", false), fclose_and_log);
-    std::string str_config = nlohmann::json(config).dump();
+    std::string str_config = nlohmann::json(config).dump(4);
     fwrite(str_config.data(), sizeof(char), str_config.size(), config_file.get());
     config_file.reset();