diff --git a/test/components/views/dialogs/InteractiveAuthDialog-test.js b/test/components/views/dialogs/InteractiveAuthDialog-test.js
index b14ea7c242..7612b43b48 100644
--- a/test/components/views/dialogs/InteractiveAuthDialog-test.js
+++ b/test/components/views/dialogs/InteractiveAuthDialog-test.js
@@ -26,6 +26,7 @@ import sdk from 'matrix-react-sdk';
 import MatrixClientPeg from '../../../../src/MatrixClientPeg';
 
 import * as test_utils from '../../../test-utils';
+import {sleep} from "../../../../src/utils/promise";
 
 const InteractiveAuthDialog = sdk.getComponent(
     'views.dialogs.InteractiveAuthDialog',
@@ -107,7 +108,7 @@ describe('InteractiveAuthDialog', function() {
                 },
             })).toBe(true);
             // let the request complete
-            return Promise.delay(1);
+            return sleep(1);
         }).then(() => {
             expect(onFinished.callCount).toEqual(1);
             expect(onFinished.calledWithExactly(true, {a: 1})).toBe(true);
diff --git a/test/components/views/rooms/MessageComposerInput-test.js b/test/components/views/rooms/MessageComposerInput-test.js
index 1105a4af17..04a5c83ed0 100644
--- a/test/components/views/rooms/MessageComposerInput-test.js
+++ b/test/components/views/rooms/MessageComposerInput-test.js
@@ -8,6 +8,7 @@ import * as testUtils from '../../../test-utils';
 import sdk from 'matrix-react-sdk';
 const MessageComposerInput = sdk.getComponent('views.rooms.MessageComposerInput');
 import MatrixClientPeg from '../../../../src/MatrixClientPeg';
+import {sleep} from "../../../../src/utils/promise";
 
 function addTextToDraft(text) {
     const components = document.getElementsByClassName('public-DraftEditor-content');
@@ -49,7 +50,7 @@ xdescribe('MessageComposerInput', () => {
         // warnings
         // (please can we make the components not setState() after
         // they are unmounted?)
-        Promise.delay(10).done(() => {
+        sleep(10).done(() => {
             if (parentDiv) {
                 ReactDOM.unmountComponentAtNode(parentDiv);
                 parentDiv.remove();