diff --git a/tests/mocha/run_mocha_tests_in_browser.js b/tests/mocha/run_mocha_tests_in_browser.js
index 3eaae0c1d..24d8c4c34 100644
--- a/tests/mocha/run_mocha_tests_in_browser.js
+++ b/tests/mocha/run_mocha_tests_in_browser.js
@@ -48,9 +48,9 @@ async function runMochaTestsInBrowser() {
     var elem = await browser.$('#failureCount');
     var text = await elem.getAttribute('tests_failed');
     return text != 'unset';
-  })
+  }, 6000);
 
-  const elem = await browser.$('#failureCount')
+  const elem = await browser.$('#failureCount');
   const numOfFailure = await elem.getAttribute('tests_failed');
 
   console.log('============Blockly Mocha Test Summary=================');