diff --git a/src/app/utils/backgroundSync.ts b/src/app/utils/backgroundSync.ts
index 9f31676..dbe334c 100644
--- a/src/app/utils/backgroundSync.ts
+++ b/src/app/utils/backgroundSync.ts
@@ -1,6 +1,13 @@
-import { Capacitor, registerPlugin, type PluginListenerHandle } from '@capacitor/core';
+import type { PluginListenerHandle } from '@capacitor/core';
 import type { IPusherRequest, MatrixClient } from 'matrix-js-sdk';
 
+const CAPACITOR_CORE_MODULE_ID = '@capacitor/core';
+
+type CapacitorCoreModule = typeof import('@capacitor/core');
+
+const loadCapacitorCore = async (): Promise<CapacitorCoreModule> =>
+  import(/* @vite-ignore */ CAPACITOR_CORE_MODULE_ID);
+
 type UnifiedPushStatus = {
   running: boolean;
   endpoint: string;
@@ -67,14 +74,15 @@ type StoredPusherState = {
   appId: string;
 };
 
-const MatrixBackgroundSync = registerPlugin<MatrixBackgroundSyncPlugin>('MatrixBackgroundSync');
 const DEFAULT_UNIFIED_PUSH_GATEWAY = 'https://matrix.gateway.unifiedpush.org/_matrix/push/v1/notify';
 const PUSHER_APP_ID_BASE = 'com.paarrot.app.android';
 const PUSHER_STORAGE_PREFIX = 'paarrot.unifiedpush';
 
 /** Returns true when the current platform is Android Capacitor. */
-export const isBackgroundSyncSupported = (): boolean =>
-  Capacitor.isNativePlatform() && Capacitor.getPlatform() === 'android';
+export const isBackgroundSyncSupported = (): boolean => {
+  const capacitor = (window as typeof window & { Capacitor?: CapacitorCoreModule['Capacitor'] }).Capacitor;
+  return Boolean(capacitor?.isNativePlatform?.() && capacitor.getPlatform() === 'android');
+};
 
 const getStoredPusherKey = (userId: string | null, deviceId: string | null): string =>
   `${PUSHER_STORAGE_PREFIX}:${userId ?? 'unknown'}:${deviceId ?? 'unknown'}`;
@@ -169,6 +177,9 @@ class AndroidUnifiedPushManager {
 
   /** Start native UnifiedPush registration and synchronize the Matrix pusher. */
   async start(mx: MatrixClient): Promise<void> {
+    const { Capacitor, registerPlugin } = await loadCapacitorCore();
+    const MatrixBackgroundSync = registerPlugin<MatrixBackgroundSyncPlugin>('MatrixBackgroundSync');
+
     console.log('[BackgroundSync] start() called, platform:', Capacitor.getPlatform(), 'isNative:', Capacitor.isNativePlatform());
     
     if (!isBackgroundSyncSupported()) {
@@ -216,6 +227,9 @@ class AndroidUnifiedPushManager {
   async stop(): Promise<void> {
     if (!isBackgroundSyncSupported()) return;
 
+    const { registerPlugin } = await loadCapacitorCore();
+    const MatrixBackgroundSync = registerPlugin<MatrixBackgroundSyncPlugin>('MatrixBackgroundSync');
+
     const client = this.client;
     if (client) {
       const deviceId = client.getDeviceId();
@@ -280,6 +294,8 @@ class AndroidUnifiedPushManager {
   /** Re-opens distributor selection once after ACTION_REQUIRED and logs actionable status. */
   private async tryRequestDistributorSetup(): Promise<void> {
     try {
+      const { registerPlugin } = await loadCapacitorCore();
+      const MatrixBackgroundSync = registerPlugin<MatrixBackgroundSyncPlugin>('MatrixBackgroundSync');
       const setupResult = await MatrixBackgroundSync.requestDistributorSetup();
       console.warn('[BackgroundSync] requestDistributorSetup result:', setupResult);
       const status = await this.safeGetStatus();
@@ -335,6 +351,9 @@ class AndroidUnifiedPushManager {
   private async ensureListeners(): Promise<void> {
     if (this.listenersReady) return;
 
+    const { registerPlugin } = await loadCapacitorCore();
+    const MatrixBackgroundSync = registerPlugin<MatrixBackgroundSyncPlugin>('MatrixBackgroundSync');
+
     this.listenerHandles = [
       await MatrixBackgroundSync.addListener('unifiedPushNewEndpoint', (event) => {
         void this.handleNewEndpoint(event).catch((err) => {
@@ -363,6 +382,9 @@ class AndroidUnifiedPushManager {
     const client = this.client;
     if (!client) return;
 
+    const { registerPlugin } = await loadCapacitorCore();
+    const MatrixBackgroundSync = registerPlugin<MatrixBackgroundSyncPlugin>('MatrixBackgroundSync');
+
     const status = await this.safeGetStatus();
     console.log('[BackgroundSync] Native status before pusher sync:', status);
     if (status?.registered && status.endpoint) {
@@ -435,6 +457,8 @@ class AndroidUnifiedPushManager {
   /** Read native registration state without failing the caller. */
   private async safeGetStatus(): Promise<UnifiedPushStatus | undefined> {
     try {
+      const { registerPlugin } = await loadCapacitorCore();
+      const MatrixBackgroundSync = registerPlugin<MatrixBackgroundSyncPlugin>('MatrixBackgroundSync');
       return await MatrixBackgroundSync.getStatus();
     } catch (err) {
       console.warn('[BackgroundSync] Failed to read UnifiedPush status:', err);
@@ -458,6 +482,8 @@ export const triggerBackgroundSyncPing = async (reason?: string): Promise<void>
   if (!isBackgroundSyncSupported()) return;
 
   try {
+    const { registerPlugin } = await loadCapacitorCore();
+    const MatrixBackgroundSync = registerPlugin<MatrixBackgroundSyncPlugin>('MatrixBackgroundSync');
     await MatrixBackgroundSync.triggerPing({ reason });
   } catch (err) {
     console.warn('[BackgroundSync] triggerPing failed:', err);
@@ -479,6 +505,8 @@ export const setAppForegroundState = async (foreground: boolean): Promise<void>
   if (!isBackgroundSyncSupported()) return;
 
   try {
+    const { registerPlugin } = await loadCapacitorCore();
+    const MatrixBackgroundSync = registerPlugin<MatrixBackgroundSyncPlugin>('MatrixBackgroundSync');
     await MatrixBackgroundSync.setAppForeground({ foreground });
   } catch (err) {
     console.warn('[BackgroundSync] setAppForeground failed:', err);
@@ -497,6 +525,8 @@ export const requestResetPushRegistration = async (): Promise<{ success: boolean
   }
 
   try {
+    const { registerPlugin } = await loadCapacitorCore();
+    const MatrixBackgroundSync = registerPlugin<MatrixBackgroundSyncPlugin>('MatrixBackgroundSync');
     const result = await MatrixBackgroundSync.requestDistributorSetup();
     console.log('[BackgroundSync] requestDistributorSetup completed:', result);
     return result ?? { success: false };
@@ -510,6 +540,8 @@ export const requestResetPushRegistration = async (): Promise<{ success: boolean
 export const getBackgroundSyncStatus = async (): Promise<UnifiedPushStatus | undefined> => {
   if (!isBackgroundSyncSupported()) return undefined;
   try {
+    const { registerPlugin } = await loadCapacitorCore();
+    const MatrixBackgroundSync = registerPlugin<MatrixBackgroundSyncPlugin>('MatrixBackgroundSync');
     return await MatrixBackgroundSync.getStatus();
   } catch (err) {
     console.warn('[BackgroundSync] getStatus failed:', err);