diff --git a/lib/Doctrine/ORM/Mapping/Driver/DatabaseDriver.php b/lib/Doctrine/ORM/Mapping/Driver/DatabaseDriver.php
index 0ee1060c7..c2d9240a2 100644
--- a/lib/Doctrine/ORM/Mapping/Driver/DatabaseDriver.php
+++ b/lib/Doctrine/ORM/Mapping/Driver/DatabaseDriver.php
@@ -110,6 +110,8 @@ class DatabaseDriver implements Driver
             return;
         }
 
+        $tables = array();
+                
         foreach ($this->_sm->listTableNames() as $tableName) {
             $tables[$tableName] = $this->_sm->listTableDetails($tableName);
         }