diff --git a/mailpoet/tests/integration/EmailEditor/Integration/Core/Renderer/RendererTest.php b/mailpoet/tests/integration/EmailEditor/Integration/Core/Renderer/RendererTest.php
index 1407c5f418..803ba2f2e1 100644
--- a/mailpoet/tests/integration/EmailEditor/Integration/Core/Renderer/RendererTest.php
+++ b/mailpoet/tests/integration/EmailEditor/Integration/Core/Renderer/RendererTest.php
@@ -23,7 +23,7 @@ class RendererTest extends \MailPoetTest {
     ]);
     $rendered = $this->renderer->render($emailPost, 'Subject', '', 'en');
     $buttonHtml = $this->extractBlockHtml($rendered['html'], 'wp-block-button', 'td');
-    verify($buttonHtml)->stringContainsString('color: #ffffff');
+    verify($buttonHtml)->stringContainsString('color: #fff');
     verify($buttonHtml)->stringContainsString('padding-bottom: 0.7em;');
     verify($buttonHtml)->stringContainsString('padding-left: 1.4em;');
     verify($buttonHtml)->stringContainsString('padding-right: 1.4em;');