diff --git a/lib/Doctrine/ORM/Tools/Export/Driver/AbstractExporter.php b/lib/Doctrine/ORM/Tools/Export/Driver/AbstractExporter.php
index 65169124c..d40d0786e 100644
--- a/lib/Doctrine/ORM/Tools/Export/Driver/AbstractExporter.php
+++ b/lib/Doctrine/ORM/Tools/Export/Driver/AbstractExporter.php
@@ -238,6 +238,12 @@ abstract class AbstractExporter
 
             case ClassMetadataInfo::GENERATOR_TYPE_IDENTITY:
                 return 'IDENTITY';
+
+            case ClassMetadataInfo::GENERATOR_TYPE_UUID:
+                return 'UUID';
+
+            case ClassMetadataInfo::GENERATOR_TYPE_CUSTOM:
+                return 'CUSTOM';
         }
     }
 }