diff --git a/src/tests/frontend/specs/inner_height.js b/src/tests/frontend/specs/inner_height.js
index 8bd0a2317..d1a6b118b 100644
--- a/src/tests/frontend/specs/inner_height.js
+++ b/src/tests/frontend/specs/inner_height.js
@@ -7,10 +7,11 @@ describe('height regression after ace.js refactoring', function () {
 
   // everything fits inside the viewport
   it('clientHeight should equal scrollHeight with few lines', async function () {
-    const aceOuter = helper.padChrome$('iframe')[0].contentDocument;
-    const clientHeight = aceOuter.documentElement.clientHeight;
-    const scrollHeight = aceOuter.documentElement.scrollHeight;
-    expect(clientHeight).to.be(scrollHeight);
+    await helper.clearPad();
+    const outerHtml = helper.padChrome$('iframe')[0].contentDocument.documentElement;
+    // Give some time for the heights to settle.
+    await new Promise((resolve) => setTimeout(resolve, 100));
+    expect(outerHtml.clientHeight).to.be(outerHtml.scrollHeight);
   });
 
   it('client height should be less than scrollHeight with many lines', async function () {
@@ -23,9 +24,8 @@ describe('height regression after ace.js refactoring', function () {
       '\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n' +
       '\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n' +
       '\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n');
-    const aceOuter = helper.padChrome$('iframe')[0].contentDocument;
-    const clientHeight = aceOuter.documentElement.clientHeight;
-    const scrollHeight = aceOuter.documentElement.scrollHeight;
-    expect(clientHeight).to.be.lessThan(scrollHeight);
+    const outerHtml = helper.padChrome$('iframe')[0].contentDocument.documentElement;
+    // Need to poll because the heights take some time to settle.
+    await helper.waitForPromise(() => outerHtml.clientHeight < outerHtml.scrollHeight);
   });
 });