diff --git a/core/modules/system/tests/themes/test_subsubtheme/test_subsubtheme.info.yml b/core/modules/system/tests/themes/test_subsubtheme/test_subsubtheme.info.yml
index c5f3a25..4f38ca4 100644
--- a/core/modules/system/tests/themes/test_subsubtheme/test_subsubtheme.info.yml
+++ b/core/modules/system/tests/themes/test_subsubtheme/test_subsubtheme.info.yml
@@ -16,5 +16,5 @@ libraries-override:
         /core/modules/system/tests/themes/test_basetheme/css/farbtastic.css: css/subsubtheme-farbtastic.css
   core/normalize:
     css:
-        base:
-          assets/vendor/normalize-css/normalize.css: false
+      base:
+        assets/vendor/normalize-css/normalize.css: false