core/modules/system/system.install                                      | 2 +-
 .../themes/experimental_theme_test/experimental_theme_test.info.yml     | 1 -
 2 files changed, 1 insertion(+), 2 deletions(-)

diff --git a/core/modules/system/system.install b/core/modules/system/system.install
index e8ca8f7979..cafd176ffa 100644
--- a/core/modules/system/system.install
+++ b/core/modules/system/system.install
@@ -84,7 +84,7 @@ function system_requirements($phase) {
     $experimental_themes = [];
     $installed_themes = \Drupal::service('theme_handler')->listInfo();
     foreach ($installed_themes as $theme => $data) {
-      if(isset($data->info['experimental']) && $data->info['experimental']) {
+      if (isset($data->info['experimental']) && $data->info['experimental']) {
         $experimental_themes[$theme] = $data->info['name'];
       }
     }
diff --git a/core/modules/system/tests/themes/experimental_theme_test/experimental_theme_test.info.yml b/core/modules/system/tests/themes/experimental_theme_test/experimental_theme_test.info.yml
index 650d23f139..e80490a4d8 100644
--- a/core/modules/system/tests/themes/experimental_theme_test/experimental_theme_test.info.yml
+++ b/core/modules/system/tests/themes/experimental_theme_test/experimental_theme_test.info.yml
@@ -5,4 +5,3 @@ version: VERSION
 core: 8.x
 base theme: false
 experimental: true
-