diff --git a/basis/windows/com/com.factor b/basis/windows/com/com.factor
index 33164f52c4..094859009d 100644
--- a/basis/windows/com/com.factor
+++ b/basis/windows/com/com.factor
@@ -11,6 +11,8 @@ COM-INTERFACE: IUnknown f {00000000-0000-0000-C000-000000000046}
     ULONG Release ( ) ;
 
 C-TYPE: IAdviseSink
+C-TYPE: IEnumFORMATETC
+C-TYPE: IEnumSTATDATA
 
 COM-INTERFACE: IDataObject IUnknown {0000010E-0000-0000-C000-000000000046}
     HRESULT GetData ( FORMATETC* pFormatetc, STGMEDIUM* pmedium )