diff --git a/src/client.js b/src/client.js
index 0f1a15cb7..60977bd61 100644
--- a/src/client.js
+++ b/src/client.js
@@ -35,6 +35,7 @@ import {StubStore} from "./store/stub";
 import {createNewMatrixCall} from "./webrtc/call";
 import {CallEventHandler} from './webrtc/callEventHandler';
 import * as utils from './utils';
+import {sleep} from './utils';
 import {
     MatrixError,
     PREFIX_MEDIA_R0,
diff --git a/src/crypto/backup.ts b/src/crypto/backup.ts
index df127baef..fbd06db25 100644
--- a/src/crypto/backup.ts
+++ b/src/crypto/backup.ts
@@ -601,6 +601,7 @@ export class Curve25519 implements BackupAlgorithm {
             const backupPubKey = decryption.init_with_private_key(privKey);
 
             if (backupPubKey !== this.authData.public_key) {
+                // eslint-disable-next-line no-throw-literal
                 throw {errcode: MatrixClient.RESTORE_BACKUP_ERROR_BAD_KEY};
             }
 
diff --git a/src/crypto/index.js b/src/crypto/index.js
index a8df354b9..904fba310 100644
--- a/src/crypto/index.js
+++ b/src/crypto/index.js
@@ -26,7 +26,6 @@ import {EventEmitter} from 'events';
 import {ReEmitter} from '../ReEmitter';
 import {logger} from '../logger';
 import * as utils from "../utils";
-import {sleep} from "../utils";
 import {OlmDevice} from "./OlmDevice";
 import * as olmlib from "./olmlib";
 import {DeviceList} from "./DeviceList";