diff --git a/core/modules/color/tests/src/Functional/ColorTranslationPreviewTest.php b/core/modules/color/tests/src/Functional/ColorTranslationPreviewTest.php
index dc26234a0d..bbc8e59300 100644
--- a/core/modules/color/tests/src/Functional/ColorTranslationPreviewTest.php
+++ b/core/modules/color/tests/src/Functional/ColorTranslationPreviewTest.php
@@ -17,7 +17,7 @@ class ColorTranslationPreviewTest extends BrowserTestBase {
    *
    * @var array
    */
-  public static $modules = ['color', 'color_test', 'language', 'locale'];
+  protected static $modules = ['color', 'color_test', 'language', 'locale'];
 
   /**
    * {@inheritdoc}