diff --git a/src/main/main.ts b/src/main/main.ts
index 93df68f..c26e946 100644
--- a/src/main/main.ts
+++ b/src/main/main.ts
@@ -1,7 +1,7 @@
 import fs from "node:fs";
 import path from "node:path";
 import { pathToFileURL } from "node:url";
-import { app, BrowserWindow, clipboard, dialog, ipcMain, Menu, powerMonitor, safeStorage, shell, Tray, type IpcMainEvent, type IpcMainInvokeEvent } from "electron";
+import { app, BrowserWindow, clipboard, dialog, ipcMain, Menu, nativeTheme, powerMonitor, safeStorage, shell, Tray, type IpcMainEvent, type IpcMainInvokeEvent } from "electron";
 import { AddLinksPayload, AppSettings, DebridProvider, EnableRemoteDiagnosticsInput, RendererSettingsUpdate, UpdateInstallProgress } from "../shared/types";
 import { AppController } from "./app-controller";
 import { IPC_CHANNELS } from "../shared/ipc";
@@ -25,8 +25,11 @@ import { validateRealDebridLoginRequest } from "../shared/preload-api";
 import { migrateProductUserDataDirectory } from "./storage";
 import { validateCollectorContainerInspectionRequest, validateCollectorInspectionRequest } from "../shared/collector";
 import { DailyStartScheduler, hasDailyStartRulePatch, prepareDailyStartSettingsPatch } from "./daily-start-scheduler";
-
-function validateString(value: unknown, name: string): string {
+import { forceDarkNativeTheme } from "./native-theme";
+
+forceDarkNativeTheme(nativeTheme);
+
+function validateString(value: unknown, name: string): string {
   if (typeof value !== "string") {
     throw new Error(`${name} muss ein String sein`);
   }
diff --git a/src/main/native-theme.ts b/src/main/native-theme.ts
new file mode 100644
index 0000000..ab2a982
--- /dev/null
+++ b/src/main/native-theme.ts
@@ -0,0 +1,7 @@
+export interface NativeThemeTarget {
+  themeSource: string;
+}
+
+export function forceDarkNativeTheme(theme: NativeThemeTarget): void {
+  theme.themeSource = "dark";
+}
diff --git a/tests/native-theme.test.ts b/tests/native-theme.test.ts
new file mode 100644
index 0000000..8e5e5be
--- /dev/null
+++ b/tests/native-theme.test.ts
@@ -0,0 +1,12 @@
+import { describe, expect, it } from "vitest";
+import { forceDarkNativeTheme } from "../src/main/native-theme";
+
+describe("native window theme", () => {
+  it("forces the native Windows title bar to use the dark theme", () => {
+    const theme = { themeSource: "system" };
+
+    forceDarkNativeTheme(theme);
+
+    expect(theme.themeSource).toBe("dark");
+  });
+});