diff --git a/include/wx/gtk/mdi.h b/include/wx/gtk/mdi.h
index e881dd1319..4338c2c39f 100644
--- a/include/wx/gtk/mdi.h
+++ b/include/wx/gtk/mdi.h
@@ -64,8 +64,6 @@ public:
 protected:
     void Init();
 
-    virtual void DoGetClientSize(int *width, int *height) const;
-
 private:
     friend class wxMDIChildFrame;
 
diff --git a/src/gtk/mdi.cpp b/src/gtk/mdi.cpp
index e966f0c877..031eae9e19 100644
--- a/src/gtk/mdi.cpp
+++ b/src/gtk/mdi.cpp
@@ -241,11 +241,6 @@ void wxMDIParentFrame::OnInternalIdle()
     }
 }
 
-void wxMDIParentFrame::DoGetClientSize(int *width, int *height ) const
-{
-    wxFrame::DoGetClientSize( width, height );
-}
-
 wxMDIChildFrame *wxMDIParentFrame::GetActiveChild() const
 {
     if (!m_clientWindow) return (wxMDIChildFrame*) NULL;