diff --git a/app_win_2_back.cpp b/app_win_2_back.cpp
index cc65a5d..6628d46 100644
--- a/app_win_2_back.cpp
+++ b/app_win_2_back.cpp
@@ -225,7 +225,7 @@ namespace gui_to_app {
 
     static void convert_to_label(std::array<char, 10> &convert,
                                  const std::string_view &err_msg,
-                                 const uint32_t data,
+                                 const std::int32_t data,
                                  Gtk::Label *const __restrict label) noexcept {
         if (const auto [ptr, ec] = std::to_chars(convert.data(), convert.data() + convert.size(), data);
             ec != std::errc()) {
@@ -244,10 +244,13 @@ namespace gui_to_app {
                                  const std::string_view short_name,
                                  const CaracInterface<Gtk::Label> &labels) noexcept {
         std::array<char, 10> convert{};
-        convert_to_label(convert, std::format("base {}", short_name), charac.get_base(), labels.base);
+        convert_to_label(convert,
+                         std::format("base {}", short_name),
+                         static_cast<std::int32_t>(charac.get_base()),
+                         labels.base);
         convert_to_label(convert,
                          std::format("carac {}", short_name),
-                         charac.get_carac(),
+                         static_cast<std::int32_t>(charac.get_carac()),
                          labels.carac);
         convert_to_label(convert,
                          std::format("materiel {}", short_name),