diff --git a/modules/amp_validator_svg/tests/src/Functional/EnableModuleTest.php b/modules/amp_validator_svg/tests/src/Functional/EnableModuleTest.php
index 4a15ac7..ecc8f28 100644
--- a/modules/amp_validator_svg/tests/src/Functional/EnableModuleTest.php
+++ b/modules/amp_validator_svg/tests/src/Functional/EnableModuleTest.php
@@ -24,7 +24,7 @@ class EnableModuleTest extends BrowserTestBase {
    *
    * @var array
    */
-  public static $modules = ['amp_validator', 'amp_validator_svg'];
+  protected static $modules = ['amp_validator', 'amp_validator_svg'];
 
   /**
    * A user with permission to administer site configuration.