diff --git a/lib/Doctrine/ORM/Tools/Export/Driver/AnnotationExporter.php b/lib/Doctrine/ORM/Tools/Export/Driver/AnnotationExporter.php
index 86b94c73d..f9a62028c 100644
--- a/lib/Doctrine/ORM/Tools/Export/Driver/AnnotationExporter.php
+++ b/lib/Doctrine/ORM/Tools/Export/Driver/AnnotationExporter.php
@@ -239,7 +239,7 @@ class AnnotationExporter extends AbstractExporter
         $str = '@Entity';
 
         if ($metadata->customRepositoryClassName) {
-            $str .= '(repositoryClass=' . $metadata->customRepositoryClassName . ')';
+            $str .= '(repositoryClass="' . $metadata->customRepositoryClassName . '")';
         }
 
         return $str;