diff --git a/tests/src/Functional/IntegrationAdminTests.php b/tests/src/Functional/IntegrationAdminTests.php
index 2cf1e91..21271c6 100644
--- a/tests/src/Functional/IntegrationAdminTests.php
+++ b/tests/src/Functional/IntegrationAdminTests.php
@@ -14,7 +14,7 @@ class IntegrationAdminTests extends SimpleIntegrationsTestBase {
    *
    * @var array
    */
-  public static $modules = ['simple_integrations'];
+  protected static $modules = ['simple_integrations'];
 
   /**
    * A test user.
diff --git a/tests/src/Functional/SimpleIntegrationsTestBase.php b/tests/src/Functional/SimpleIntegrationsTestBase.php
index 29b13f8..767cd3d 100644
--- a/tests/src/Functional/SimpleIntegrationsTestBase.php
+++ b/tests/src/Functional/SimpleIntegrationsTestBase.php
@@ -18,7 +18,7 @@ abstract class SimpleIntegrationsTestBase extends BrowserTestBase {
    *
    * @var array
    */
-  public static $modules = ['simple_integrations'];
+  protected static $modules = ['simple_integrations'];
 
   /**
    * An integration.