diff --git a/core/config/core.extension.yml b/core/config/core.extension.yml
index 1514a9e..eae39ef 100644
--- a/core/config/core.extension.yml
+++ b/core/config/core.extension.yml
@@ -1,4 +1,5 @@
 module: {}
-theme: {}
+theme:
+  stark: 0
 disabled:
   theme: {}
diff --git a/core/modules/config/lib/Drupal/config/Tests/Storage/FileStorageTest.php b/core/modules/config/lib/Drupal/config/Tests/Storage/FileStorageTest.php
index 6a99605..d430bd3 100644
--- a/core/modules/config/lib/Drupal/config/Tests/Storage/FileStorageTest.php
+++ b/core/modules/config/lib/Drupal/config/Tests/Storage/FileStorageTest.php
@@ -53,7 +53,7 @@ protected function delete($name) {
    */
   protected function testlistAll() {
     $expected_files = array(
-      'system.module',
+      'core.extension',
       'system.performance',
     );
 
diff --git a/core/modules/system/config/system.module.yml b/core/modules/system/config/system.module.yml
deleted file mode 100644
index 9ec80e1..0000000
--- a/core/modules/system/config/system.module.yml
+++ /dev/null
@@ -1,2 +0,0 @@
-enabled:
-  system: 0