diff --git a/app/global.d.ts b/app/global.d.ts
index 8ee636bcd3c..6c2f5c74163 100644
--- a/app/global.d.ts
+++ b/app/global.d.ts
@@ -34,3 +34,8 @@ declare interface Window {
     };
   };
 }
+
+interface Window {
+  webkitAudioContext: typeof AudioContext;
+  _SW_ENABLED?: boolean;
+}
diff --git a/app/utils/chat.ts b/app/utils/chat.ts
index 2c165286719..7d25a5b738f 100644
--- a/app/utils/chat.ts
+++ b/app/utils/chat.ts
@@ -123,7 +123,7 @@ export function base64Image2Blob(base64Data: string, contentType: string) {
 }
 
 export function uploadImage(file: Blob): Promise<string> {
-  if (!(window as any)._SW_ENABLED) {
+  if (!(window as Window & {_SW_ENABLED?: boolean})._SW_ENABLED) {
     // if serviceWorker register error, using compressImage
     return compressImage(file, 256 * 1024);
   }