diff --git a/include/wx/msw/glcanvas.h b/include/wx/msw/glcanvas.h
index 203816b4ea..d37a569768 100644
--- a/include/wx/msw/glcanvas.h
+++ b/include/wx/msw/glcanvas.h
@@ -46,6 +46,7 @@ private:
 class WXDLLIMPEXP_GL wxGLCanvas : public wxGLCanvasBase
 {
 public:
+    wxEXPLICIT // avoid implicitly converting a wxWindow* to wxGLCanvas
     wxGLCanvas(wxWindow *parent,
                wxWindowID id = wxID_ANY,
                const int *attribList = NULL,