diff --git a/samples/widgets/widgets.cpp b/samples/widgets/widgets.cpp
index 90ac92a059..12e471fe26 100644
--- a/samples/widgets/widgets.cpp
+++ b/samples/widgets/widgets.cpp
@@ -49,6 +49,7 @@
 #include "wx/numdlg.h"
 #include "wx/textdlg.h"
 #include "wx/imaglist.h"
+#include "wx/treectrl.h"
 #include "wx/wupdlock.h"
 #include "wx/textcompleter.h"
 
diff --git a/samples/widgets/widgets.h b/samples/widgets/widgets.h
index b228fe110b..65d7708133 100644
--- a/samples/widgets/widgets.h
+++ b/samples/widgets/widgets.h
@@ -41,6 +41,7 @@ class WXDLLIMPEXP_FWD_CORE wxCheckBox;
 class WXDLLIMPEXP_FWD_CORE wxSizer;
 class WXDLLIMPEXP_FWD_CORE wxImageList;
 class WXDLLIMPEXP_FWD_CORE wxTextCtrl;
+class WXDLLIMPEXP_FWD_CORE wxTextEntryBase;
 class WXDLLIMPEXP_FWD_CORE WidgetsBookCtrl;
 
 class WidgetsPageInfo;