diff --git a/tools/upend_js/api.ts b/tools/upend_js/api.ts
index ab9d512..2489380 100644
--- a/tools/upend_js/api.ts
+++ b/tools/upend_js/api.ts
@@ -13,7 +13,7 @@ import type {
   StoreInfo,
   VaultInfo,
 } from "./types";
-import init_wasm, { InitOutput } from "upend_wasm";
+import init_wasm from "upend_wasm";
 import {
   AddressComponents,
   AddressTypeConstants,
@@ -30,7 +30,7 @@ export class UpEndApi {
 
   private wasmPath: string | undefined;
   private wasmInitialized = false;
-  private wasmPromise: Promise<InitOutput> | undefined;
+  private wasmPromise: Promise<unknown> | undefined;
   private addressTypeConstants: AddressTypeConstants | undefined = undefined;
 
   private queryOnceLRU = new LRU<string, UpListing>({ max: 128 });