diff --git a/src/slic3r/GUI/Preferences.cpp b/src/slic3r/GUI/Preferences.cpp
index 3e67c9847..064515ece 100644
--- a/src/slic3r/GUI/Preferences.cpp
+++ b/src/slic3r/GUI/Preferences.cpp
@@ -1204,6 +1204,7 @@ wxWindow* PreferencesDialog::create_debug_page()
     debug_button->Bind(wxEVT_LEFT_DOWN, [this](wxMouseEvent &e) {
         // success message box
         MessageDialog dialog(this, _L("save debug settings"), _L("DEBUG settings have saved successfully!"), wxNO_DEFAULT | wxYES_NO | wxICON_INFORMATION);
+        dialog.SetSize(400,-1);
         switch (dialog.ShowModal()) {
         case wxID_NO: {
             //if (m_developer_mode_def != app_config->get("developer_mode")) {