diff --git a/packages/mesh-wallet/src/browser/browser-wallet.ts b/packages/mesh-wallet/src/browser/browser-wallet.ts
index 11cd56166..19f2bb4ad 100644
--- a/packages/mesh-wallet/src/browser/browser-wallet.ts
+++ b/packages/mesh-wallet/src/browser/browser-wallet.ts
@@ -41,7 +41,7 @@ import { Cardano, WalletInstance } from "../types";
 
 declare global {
   interface Window {
-    cardano: Cardano;
+    cardano?: Cardano;
   }
 }