diff --git a/contrib/include/wx/xml/xmlres.h b/contrib/include/wx/xml/xmlres.h
index 673680886f..7a74f89dbc 100644
--- a/contrib/include/wx/xml/xmlres.h
+++ b/contrib/include/wx/xml/xmlres.h
@@ -30,6 +30,7 @@ class WXDLLEXPORT wxMenuBar;
 class WXDLLEXPORT wxDialog;
 class WXDLLEXPORT wxPanel;
 class WXDLLEXPORT wxWindow;
+class WXDLLEXPORT wxFrame;
 class WXDLLEXPORT wxToolBar;
 
 class WXDLLEXPORT wxXmlResourceHandler;
diff --git a/contrib/src/xml/xmlres.cpp b/contrib/src/xml/xmlres.cpp
index 7c204def23..e3d304dc8a 100644
--- a/contrib/src/xml/xmlres.cpp
+++ b/contrib/src/xml/xmlres.cpp
@@ -21,6 +21,7 @@
 
 #include "wx/dialog.h"
 #include "wx/panel.h"
+#include "wx/frame.h"
 #include "wx/wfstream.h"
 #include "wx/filesys.h"
 #include "wx/log.h"