diff --git a/include/wx/window.h b/include/wx/window.h
index 22fc655a4b..814e9487ad 100644
--- a/include/wx/window.h
+++ b/include/wx/window.h
@@ -2073,7 +2073,7 @@ extern WXDLLIMPEXP_CORE wxPoint wxGetMousePosition();
 extern WXDLLIMPEXP_CORE wxWindow *wxGetActiveWindow();
 
 // get the (first) top level parent window
-WXDLLIMPEXP_CORE wxWindow* wxGetTopLevelParent(wxWindow *win);
+WXDLLIMPEXP_CORE wxWindow* wxGetTopLevelParent(wxWindowBase *win);
 
 #if wxUSE_ACCESSIBILITY
 // ----------------------------------------------------------------------------
diff --git a/src/common/wincmn.cpp b/src/common/wincmn.cpp
index 0ea559aab3..0cd0df79eb 100644
--- a/src/common/wincmn.cpp
+++ b/src/common/wincmn.cpp
@@ -3655,8 +3655,9 @@ void wxWindowBase::DragAcceptFiles(bool accept)
 // global functions
 // ----------------------------------------------------------------------------
 
-wxWindow* wxGetTopLevelParent(wxWindow *win)
+wxWindow* wxGetTopLevelParent(wxWindowBase *win_)
 {
+    wxWindow* win = static_cast<wxWindow *>(win_);
     while ( win && !win->IsTopLevel() )
          win = win->GetParent();