diff --git a/packages/client/src/config.ts b/packages/client/src/config.ts
index d1d6ff20b8..89c25c9430 100644
--- a/packages/client/src/config.ts
+++ b/packages/client/src/config.ts
@@ -1,6 +1,6 @@
 import { $i } from "@/account";
 // #v-ifdef VITE_CAPACITOR
-const address = $i ? new URL($i.instanceUrl) : null;
+const address = $i ? new URL($i.instanceUrl) : "localhost";
 // #v-else
 const address = new URL(location.href);
 // #v-endif
diff --git a/packages/client/src/os.ts b/packages/client/src/os.ts
index 895fe41a41..2805385f8d 100644
--- a/packages/client/src/os.ts
+++ b/packages/client/src/os.ts
@@ -16,7 +16,7 @@ export const pendingApiRequestsCount = ref(0);
 
 const apiClient = new Misskey.api.APIClient({
 	// #v-ifdef VITE_CAPACITOR
-	origin: $i?.instanceUrl || window.location.origin,
+	origin: $i?.instanceUrl || url || window.location.origin,
 	// #v-else
 	origin: url,
 	// #v-endif