diff --git a/samples/drawing/drawing.cpp b/samples/drawing/drawing.cpp
index 8a502ad97b..acd2eeaa47 100644
--- a/samples/drawing/drawing.cpp
+++ b/samples/drawing/drawing.cpp
@@ -2108,7 +2108,7 @@ void MyCanvas::UseGraphicRenderer(wxGraphicsRenderer* renderer)
 
 
 #if wxUSE_DC_TRANSFORM_MATRIX
-#include <wx/valnum.h>
+#include "wx/valnum.h"
 
 class TransformDataDialog : public wxDialog
 {