diff --git a/v2rayN/v2rayN/ViewModels/MainWindowViewModel.cs b/v2rayN/v2rayN/ViewModels/MainWindowViewModel.cs
index 0902d88080..ef654fe515 100644
--- a/v2rayN/v2rayN/ViewModels/MainWindowViewModel.cs
+++ b/v2rayN/v2rayN/ViewModels/MainWindowViewModel.cs
@@ -1726,6 +1726,10 @@ private void BindingUI()
                             {
                                 ModifyTheme(!Utils.IsLightTheme());
                             }
+                            else
+                            {
+                                ModifyTheme(ColorModeDark);
+                            }
                         }
                     });