diff --git a/packages/rich-text-editor/test/a11y.common.js b/packages/rich-text-editor/test/a11y.common.js
index eac65e6e87..8a93776e41 100644
--- a/packages/rich-text-editor/test/a11y.common.js
+++ b/packages/rich-text-editor/test/a11y.common.js
@@ -13,7 +13,6 @@ import sinon from 'sinon';
 import { getDeepActiveElement } from '@vaadin/a11y-base/src/focus-utils.js';
 
 describe('accessibility', () => {
-  'use strict';
   let rte, content, buttons, announcer, editor;
 
   const flushFormatAnnouncer = () => {
diff --git a/packages/rich-text-editor/test/basic.common.js b/packages/rich-text-editor/test/basic.common.js
index cc76b36878..fad92c4a8d 100644
--- a/packages/rich-text-editor/test/basic.common.js
+++ b/packages/rich-text-editor/test/basic.common.js
@@ -4,7 +4,6 @@ import sinon from 'sinon';
 import { createImage } from './helpers.js';
 
 describe('rich text editor', () => {
-  'use strict';
   let rte, editor;
 
   const flushValueDebouncer = () => rte.__debounceSetValue && rte.__debounceSetValue.flush();