diff --git a/samples/notebook/notebook.cpp b/samples/notebook/notebook.cpp
index 7943c7a028..eeb65f56d4 100644
--- a/samples/notebook/notebook.cpp
+++ b/samples/notebook/notebook.cpp
@@ -58,7 +58,7 @@ bool MyApp::OnInit()
 #endif
 }
 
-void MyApp::InitTabView(wxNotebook* notebook, wxPanel* window)
+void MyApp::InitTabView(wxNotebook* notebook, wxTopLevelWindow* window)
 {
   m_okButton = new wxButton(window, wxID_OK, "Close", wxPoint(-1, -1), wxSize(80, 25));
   m_cancelButton = new wxButton(window, ID_DELETE_PAGE, "&Delete page", wxPoint(-1, -1), wxSize(80, 25));
diff --git a/samples/notebook/notebook.h b/samples/notebook/notebook.h
index 7cad0bed4c..1f6e965f65 100644
--- a/samples/notebook/notebook.h
+++ b/samples/notebook/notebook.h
@@ -16,7 +16,7 @@ class MyApp: public wxApp
 {
 public:
     bool OnInit();
-    void InitTabView(wxNotebook* notebook, wxPanel* window);
+    void InitTabView(wxNotebook* notebook, wxTopLevelWindow* window);
 
     wxButton*   m_okButton;
     wxButton*   m_cancelButton;