diff --git a/lib/Doctrine/Common/Annotations/AnnotationRegistry.php b/lib/Doctrine/Common/Annotations/AnnotationRegistry.php
index 13abaf50d..e26a2117e 100644
--- a/lib/Doctrine/Common/Annotations/AnnotationRegistry.php
+++ b/lib/Doctrine/Common/Annotations/AnnotationRegistry.php
@@ -166,6 +166,10 @@ public static function loadAnnotationClass(string $class) : bool
                 return true;
             }
         }
+        
+        if (self::$loaders === [] && self::$autoloadNamespaces === [] && \class_exists($class)) {
+            return true;
+        }
 
         self::$failedToAutoload[$class] = null;