diff --git a/lib/Doctrine/ORM/Query/Filter/SQLFilter.php b/lib/Doctrine/ORM/Query/Filter/SQLFilter.php
index 3c6daaaad..b0248fbac 100644
--- a/lib/Doctrine/ORM/Query/Filter/SQLFilter.php
+++ b/lib/Doctrine/ORM/Query/Filter/SQLFilter.php
@@ -46,7 +46,7 @@ abstract class SQLFilter
      *
      * @var array
      */
-    private $parameters;
+    private $parameters = [];
 
     /**
      * Constructs the SQLFilter object.