diff --git a/src/slic3r/GUI/Plater.cpp b/src/slic3r/GUI/Plater.cpp
index 7fe142e44..fe742ad2b 100644
--- a/src/slic3r/GUI/Plater.cpp
+++ b/src/slic3r/GUI/Plater.cpp
@@ -3503,7 +3503,7 @@ std::vector<size_t> Plater::priv::load_files(const std::vector<fs::path>& input_
                                     warning_message += "-" + *it + "\n";
                                 warning_message += "\n";
                                 //show_info(q, _L("The 3mf has following customized filament or printer presets:") + warning_message + _L("Please confirm that the G-codes within these presets are safe to prevent any damage to the machine!"), _L("Customized Preset"));
-                                MessageDialog dlg(q, _L("The 3mf has following customized filament or printer presets:") + warning_message+ _L("Please confirm that the G-codes within these presets are safe to prevent any damage to the machine!"), _L("Customized Preset"));
+                                MessageDialog dlg(q, _L("The 3mf has following customized filament or printer presets:") + from_u8(warning_message)+ _L("Please confirm that the G-codes within these presets are safe to prevent any damage to the machine!"), _L("Customized Preset"));
                                 dlg.show_dsa_button();
                                 auto  res = dlg.ShowModal();
                                 if (dlg.get_checkbox_state())