diff --git a/core/lib/Drupal/Core/Asset/LibraryDiscoveryParser.php b/core/lib/Drupal/Core/Asset/LibraryDiscoveryParser.php
index 7ea5522..a0d4d53 100644
--- a/core/lib/Drupal/Core/Asset/LibraryDiscoveryParser.php
+++ b/core/lib/Drupal/Core/Asset/LibraryDiscoveryParser.php
@@ -9,7 +9,7 @@
 
 use Drupal\Core\Asset\Exception\IncompleteLibraryDefinitionException;
 use Drupal\Core\Asset\Exception\InvalidCssCategoryException;
-use Drupal\Core\Asset\Exception\InvalidDefinitionOfCssException;
+use Drupal\Core\Asset\Exception\InvalidCssDefinitionException;
 use Drupal\Core\Asset\Exception\InvalidLibraryFileException;
 use Drupal\Core\Asset\Exception\LibraryDefinitionMissingLicenseException;
 use Drupal\Core\Extension\ModuleHandlerInterface;
@@ -121,7 +121,7 @@ public function buildByExtension($extension) {
         if ($type == 'css' && !empty($library[$type])) {
           foreach ($library[$type] as $category => $files) {
             if (empty($files)) {
-              throw new InvalidDefinitionOfCssException(sprintf("You have to key the css files in the %s.library.yml file by category ('%s' seems to be a file name, allowed categories are Base, Layout, Component, State, Theme)", $extension, $category));
+              throw new InvalidCssDefinitionException(sprintf("You have to key the css files in the %s.library.yml file by category ('%s' seems to be a file name, allowed categories are Base, Layout, Component, State, Theme)", $extension, $category));
             }
             foreach ($files as $source => $options) {
               if (!isset($options['weight'])) {
diff --git a/core/modules/system/tests/modules/common_test/common_test.module b/core/modules/system/tests/modules/common_test/common_test.module
index e04f9a7..01419bb 100644
--- a/core/modules/system/tests/modules/common_test/common_test.module
+++ b/core/modules/system/tests/modules/common_test/common_test.module
@@ -172,9 +172,11 @@ function common_test_library_info_build() {
   if (\Drupal::state()->get('common_test.library_info_build_test')) {
     $libraries['dynamic_library'] = [
       'version' => '1.0',
-      'css' => ['theme' => [
-        'common_test.css' => [],
-      ]],
+      'css' => [
+        'theme' => [
+          'common_test.css' => [],
+        ],
+      ],
     ];
   }
   return $libraries;