diff --git a/lib/documentmanagement/DocumentFieldLink.inc b/lib/documentmanagement/DocumentFieldLink.inc
index e885ddb..86cd522 100644
--- a/lib/documentmanagement/DocumentFieldLink.inc
+++ b/lib/documentmanagement/DocumentFieldLink.inc
@@ -30,6 +30,8 @@
  * Contributor( s): ______________________________________
  */
 
+require_once(KT_LIB_DIR . "/util/sanitize.inc");
+
 class DocumentFieldLink extends KTEntity {
 	
 	/** document field link primary key */