diff --git a/tools/widl/typelib.c b/tools/widl/typelib.c
index c597138dd6b..63d86c9aceb 100644
--- a/tools/widl/typelib.c
+++ b/tools/widl/typelib.c
@@ -145,6 +145,7 @@ unsigned short get_type_vt(type_t *t)
       return VT_DISPATCH;
     return VT_USERDEFINED;
         
+  case RPC_FC_ENUM16:
   case RPC_FC_STRUCT:
   case RPC_FC_PSTRUCT:
     return VT_USERDEFINED;