--- oovbaapi/org/openoffice/excel/XWorkbook.idl	
+++ oovbaapi/org/openoffice/excel/XWorkbook.idl
@@ -5,6 +5,10 @@
 #include <com/sun/star/uno/XInterface.idl>
 #endif
 
+#ifndef __org_openoffice_vba_XHelperInterface_idl__
+#include <org/openoffice/vba/XHelperInterface.idl>
+#endif
+
 //=============================================================================
 
 module org {  module openoffice {  module excel { 
@@ -14,8 +18,10 @@ module org {  module openoffice {  modul
 interface XWorksheet;
 interface XWorksheets;
 
-interface XWorkbook: com::sun::star::uno::XInterface
+interface XWorkbook
 {
+	interface ::org::openoffice::vba::XHelperInterface;
+
 	[attribute, readonly] string  Name;
 	[attribute, readonly] string  Path;
 	[attribute, readonly] string  FullName;
