diff -u b/core/lib/Drupal/Core/Plugin/Discovery/AnnotatedClassDiscovery.php b/core/lib/Drupal/Core/Plugin/Discovery/AnnotatedClassDiscovery.php
--- b/core/lib/Drupal/Core/Plugin/Discovery/AnnotatedClassDiscovery.php
+++ b/core/lib/Drupal/Core/Plugin/Discovery/AnnotatedClassDiscovery.php
@@ -55,7 +55,7 @@
             if ($fileinfo->getExtension() == 'php') {
               $className = str_replace(DIRECTORY_SEPARATOR, '\\', "$prefix/". $fileinfo->getBasename('.php'));
               $finder = DumbFindFile::create($fileinfo->getPathName());
-              $staticReflectionParser = new StaticReflectionParser($className, $finder, TRUE);
+              $staticReflectionParser = new StaticReflectionParser($className, $finder);
               if ($annotation = $reader->getClassAnnotation($staticReflectionParser->getReflectionClass(), 'Drupal\Core\Annotation\Plugin')) {
                 $definition = $annotation->get();
                 $definition['class'] = $className;