diff --git a/source/ui/global.d.ts b/source/ui/global.d.ts
index 232a8303..2d1d783a 100644
--- a/source/ui/global.d.ts
+++ b/source/ui/global.d.ts
@@ -36,4 +36,8 @@ declare const ENV_PRODUCTION: boolean;
 declare const ENV_LOCAL: boolean;
 
 // Google Analytics global variable
-declare const ga: any;
\ No newline at end of file
+declare const ga: any;
+
+declare interface Window {
+    webkitAudioContext: typeof AudioContext
+}