diff --git a/contrib/rddads/rddads.h b/contrib/rddads/rddads.h
index b21803e98f..001f393364 100644
--- a/contrib/rddads/rddads.h
+++ b/contrib/rddads/rddads.h
@@ -44,6 +44,8 @@
  *
  */
 
+#include "hbapi.h"
+#include "hbapiitm.h"
 #include "hbapirdd.h"
 
 #if defined( HB_OS_WIN )