diff --git a/src/currency_core/currency_config.h b/src/currency_core/currency_config.h
index bda8f652..4dfa5e12 100644
--- a/src/currency_core/currency_config.h
+++ b/src/currency_core/currency_config.h
@@ -211,7 +211,7 @@
 #define MINER_CONFIG_FILENAME                           "miner_conf.json"
 #define GUI_SECURE_CONFIG_FILENAME                      "gui_secure_conf.bin"
 #define GUI_CONFIG_FILENAME                             "gui_settings.json"
-#define GUI_INTERNAL_CONFIG                             "gui_internal_config.bin"
+#define GUI_INTERNAL_CONFIG2                            "gui_internal_config.json"
 
 
 
diff --git a/src/gui/qt-daemon/application/mainwindow.cpp b/src/gui/qt-daemon/application/mainwindow.cpp
index 7f509188..acdaef1c 100644
--- a/src/gui/qt-daemon/application/mainwindow.cpp
+++ b/src/gui/qt-daemon/application/mainwindow.cpp
@@ -387,9 +387,9 @@ void MainWindow::changeEvent(QEvent *e)
 bool MainWindow::store_app_config()
 {
   TRY_ENTRY();
-  std::string conf_path = m_backend.get_config_folder() + "/" + GUI_INTERNAL_CONFIG;
-  LOG_PRINT_L0("storing gui internal config from " << conf_path);
-  CHECK_AND_ASSERT_MES(tools::serialize_obj_to_file(m_config, conf_path), false, "failed to store gui internal config");
+  std::string conf_path = m_backend.get_config_folder() + "/" + GUI_INTERNAL_CONFIG2;
+  LOG_PRINT_L0("storing gui internal config to " << conf_path);
+  CHECK_AND_ASSERT_MES(epee::serialization::store_t_to_json_file(m_config, conf_path), false, "failed to store gui internal config");
   return true;
   CATCH_ENTRY2(false);
 }
@@ -397,9 +397,9 @@ bool MainWindow::store_app_config()
 bool MainWindow::load_app_config()
 {
   TRY_ENTRY();
-  std::string conf_path = m_backend.get_config_folder() + "/" + GUI_INTERNAL_CONFIG;
+  std::string conf_path = m_backend.get_config_folder() + "/" + GUI_INTERNAL_CONFIG2;
   LOG_PRINT_L0("loading gui internal config from " << conf_path);
-  bool r = tools::unserialize_obj_from_file(m_config, conf_path);
+  bool r = epee::serialization::load_t_from_json_file(m_config, conf_path);
   LOG_PRINT_L0("gui internal config " << (r ? "loaded ok" : "was not loaded"));
   return r;
   CATCH_ENTRY2(false);
diff --git a/src/gui/qt-daemon/application/mainwindow.h b/src/gui/qt-daemon/application/mainwindow.h
index 3c67b509..57fcf129 100644
--- a/src/gui/qt-daemon/application/mainwindow.h
+++ b/src/gui/qt-daemon/application/mainwindow.h
@@ -8,6 +8,7 @@
 #include <QWebChannel>
 
 #include "wallet/view_iface.h"
+#include "serialization/keyvalue_helper_structs.h"
 
 #ifndef Q_MOC_RUN
 #include "wallet/wallets_manager.h"
@@ -60,11 +61,20 @@ public:
 
   struct app_config
   {
-    std::pair<int64_t, int64_t> m_window_position;
-    std::pair<int64_t, int64_t> m_window_size;
+    
+    epee::kvserializable_pair<int64_t, int64_t> m_window_position;
+    epee::kvserializable_pair<int64_t, int64_t> m_window_size;
     bool is_maximazed;
     bool is_showed;
     bool disable_notifications;
+
+    BEGIN_KV_SERIALIZE_MAP()
+      KV_SERIALIZE(m_window_position)
+      KV_SERIALIZE(m_window_size)
+      KV_SERIALIZE(is_maximazed)
+      KV_SERIALIZE(is_showed)
+      KV_SERIALIZE(disable_notifications)
+    END_KV_SERIALIZE_MAP()
   };
 
   protected slots: