diff --git a/tests/src/Functional/ReadOnlyConfigTest.php b/tests/src/Functional/ReadOnlyConfigTest.php
index 07a02d6..56614cb 100644
--- a/tests/src/Functional/ReadOnlyConfigTest.php
+++ b/tests/src/Functional/ReadOnlyConfigTest.php
@@ -85,7 +85,7 @@ class ReadOnlyConfigTest extends BrowserTestBase {
 
     // Enable the action module to confirm we can submit the form.
     $edit = [
-      'modules[Core][action][enable]' => 'action',
+      'modules[action][enable]' => TRUE,
     ];
     $this->drupalPostForm($module_url, $edit, 'Install');
     $this->assertSession()->pageTextNotContains($this->message);