diff --git a/lib/Doctrine/ORM/Tools/SchemaTool.php b/lib/Doctrine/ORM/Tools/SchemaTool.php
index 2a858c493..1e8acaa3d 100644
--- a/lib/Doctrine/ORM/Tools/SchemaTool.php
+++ b/lib/Doctrine/ORM/Tools/SchemaTool.php
@@ -231,7 +231,6 @@ class SchemaTool
 
                             foreach ($idMapping['joinColumns'] as $joinColumn) {
                                 if (isset($targetEntity->fieldMappings[$joinColumn['referencedColumnName']])) {
-                                    $idMapping = $targetEntity->fieldMappings[$joinColumn['referencedColumnName']];
                                     $columnName = $this->quoteStrategy->getJoinColumnName(
                                         $joinColumn,
                                         $class,