diff --git a/src/crypto/api.ts b/src/crypto/api.ts
index 1bd65d7db..3ccc21ce8 100644
--- a/src/crypto/api.ts
+++ b/src/crypto/api.ts
@@ -142,7 +142,7 @@ export interface IImportOpts {
 }
 
 export interface IImportRoomKeysOpts {
-    progressCallback: (stage: IImportOpts) => void;
+    progressCallback?: (stage: IImportOpts) => void;
     untrusted?: boolean;
     source?: string; // TODO: Enum
 }
diff --git a/src/crypto/index.ts b/src/crypto/index.ts
index e35eef493..455169f3c 100644
--- a/src/crypto/index.ts
+++ b/src/crypto/index.ts
@@ -40,7 +40,7 @@ import {
     ISecretRequest,
     SecretStorageKeyObject,
 } from './SecretStorage';
-import { IAddSecretStorageKeyOpts, ISecretStorageKeyInfo } from "./api";
+import { IAddSecretStorageKeyOpts, IImportRoomKeysOpts, ISecretStorageKeyInfo } from "./api";
 import { OutgoingRoomKeyRequestManager } from './OutgoingRoomKeyRequestManager';
 import { IndexedDBCryptoStore } from './store/indexeddb-crypto-store';
 import { ReciprocateQRCode, SCAN_QR_CODE_METHOD, SHOW_QR_CODE_METHOD } from './verification/QRCode';
@@ -2658,7 +2658,7 @@ export class Crypto extends EventEmitter {
      * @param {Function} opts.progressCallback called with an object which has a stage param
      * @return {Promise} a promise which resolves once the keys have been imported
      */
-    public importRoomKeys(keys: IMegolmSessionData[], opts: any = {}): Promise<any> { // TODO types
+    public importRoomKeys(keys: IMegolmSessionData[], opts: IImportRoomKeysOpts = {}): Promise<any> { // TODO types
         let successes = 0;
         let failures = 0;
         const total = keys.length;