diff --git a/lib/Doctrine/ORM/Tools/Export/Driver/XmlExporter.php b/lib/Doctrine/ORM/Tools/Export/Driver/XmlExporter.php
index f9668c78f..01309475b 100644
--- a/lib/Doctrine/ORM/Tools/Export/Driver/XmlExporter.php
+++ b/lib/Doctrine/ORM/Tools/Export/Driver/XmlExporter.php
@@ -139,6 +139,9 @@ class XmlExporter extends AbstractExporter
                 if (isset($field['columnName'])) {
                     $idXml->addAttribute('column', $field['columnName']);
                 }
+                if (isset($field['associationKey']) && $field['associationKey']) {
+                    $idXml->addAttribute('association-key', 'true');
+                }
                 if ($idGeneratorType = $this->_getIdGeneratorTypeString($metadata->generatorType)) {
                     $generatorXml = $idXml->addChild('generator');
                     $generatorXml->addAttribute('strategy', $idGeneratorType);