diff --git a/src/cascadia/TerminalSettingsEditor/MainPage.cpp b/src/cascadia/TerminalSettingsEditor/MainPage.cpp
index 696579ae950..739e0c5e6f8 100644
--- a/src/cascadia/TerminalSettingsEditor/MainPage.cpp
+++ b/src/cascadia/TerminalSettingsEditor/MainPage.cpp
@@ -705,6 +705,12 @@ namespace winrt::Microsoft::Terminal::Settings::Editor::implementation
     // can have mica too.
     void MainPage::_UpdateBackgroundForMica()
     {
+        // If we're in high contrast mode, don't override the theme.
+        if (Windows::UI::ViewManagement::AccessibilitySettings accessibilitySettings; accessibilitySettings.HighContrast())
+        {
+            return;
+        }
+
         bool isMicaAvailable = false;
 
         // Check to see if our hosting window supports Mica at all. We'll check
diff --git a/src/cascadia/TerminalSettingsEditor/MainPage.xaml b/src/cascadia/TerminalSettingsEditor/MainPage.xaml
index 7d96589f0ec..ed82d1b2efb 100644
--- a/src/cascadia/TerminalSettingsEditor/MainPage.xaml
+++ b/src/cascadia/TerminalSettingsEditor/MainPage.xaml
@@ -44,11 +44,10 @@
                         <ResourceDictionary x:Key="HighContrast">
                             <!--  Define resources for HighContrast mode here  -->
                             <StaticResource x:Key="SettingsPageBackground"
-                                            ResourceKey="SystemColorWindowColorBrush" />
+                                            ResourceKey="SystemColorWindowBrush" />
                             <StaticResource x:Key="SettingsPageMicaBackground"
-                                            ResourceKey="SystemColorWindowColorBrush" />
+                                            ResourceKey="SystemColorWindowBrush" />
                         </ResourceDictionary>
-
                     </ResourceDictionary.ThemeDictionaries>
                 </ResourceDictionary>
 
diff --git a/src/cascadia/TerminalSettingsEditor/pch.h b/src/cascadia/TerminalSettingsEditor/pch.h
index 2e9eba2f51a..8d9382aaeb0 100644
--- a/src/cascadia/TerminalSettingsEditor/pch.h
+++ b/src/cascadia/TerminalSettingsEditor/pch.h
@@ -31,6 +31,7 @@
 #include <winrt/Windows.UI.Input.h>
 #include <winrt/Windows.UI.Popups.h>
 #include <winrt/Windows.UI.Text.h>
+#include <winrt/Windows.UI.ViewManagement.h>
 #include <winrt/Windows.UI.Xaml.h>
 #include <winrt/Windows.UI.Xaml.Automation.h>
 #include <winrt/Windows.UI.Xaml.Automation.Peers.h>