diff --git a/include/wx/docview.h b/include/wx/docview.h
index 994487059a..cc728d8e16 100644
--- a/include/wx/docview.h
+++ b/include/wx/docview.h
@@ -20,6 +20,7 @@
 #include "wx/list.h"
 #include "wx/cmndata.h"
 #include "wx/string.h"
+#include "wx/frame.h"
 
 #if wxUSE_PRINTING_ARCHITECTURE
     #include "wx/print.h"
diff --git a/include/wx/html/helpfrm.h b/include/wx/html/helpfrm.h
index 0eb200c8a0..cb69605813 100644
--- a/include/wx/html/helpfrm.h
+++ b/include/wx/html/helpfrm.h
@@ -33,6 +33,7 @@
 #include "wx/stattext.h"
 #include "wx/html/htmlwin.h"
 #include "wx/html/htmprint.h"
+class WXDLLEXPORT wxButton;
 
 
 // style flags for the Help Frame