diff --git a/src/slic3r/GUI/GUI_App.cpp b/src/slic3r/GUI/GUI_App.cpp
index c04e52f1ec..8fd8dd30a0 100644
--- a/src/slic3r/GUI/GUI_App.cpp
+++ b/src/slic3r/GUI/GUI_App.cpp
@@ -3645,9 +3645,15 @@ bool GUI_App::dark_mode()
     // proper dark mode was first introduced.
     return wxPlatformInfo::Get().CheckOSVersion(10, 14) && mac_dark_mode();
 #else
-    return wxGetApp().app_config->get("dark_color_mode") == "1" ? true : check_dark_mode();
-    //const unsigned luma = get_colour_approx_luma(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW));
-    //return luma < 128;
+    // When the user has explicitly chosen a mode, honour it directly.
+    // Falling through to check_dark_mode() for an explicit "0" would query
+    // wxSystemSettings::GetAppearance().IsDark(), which is contaminated by
+    // wxWidgets 3.3's MSWEnableDarkMode(DarkMode_Auto) and can return true
+    // even though the user asked for light mode.
+    const auto &val = wxGetApp().app_config->get("dark_color_mode");
+    if (val == "1") return true;
+    if (val == "0") return false;
+    return check_dark_mode();
 #endif
 #else
     //BBS disable DarkUI mode