diff --git a/include/wx/gtk/window.h b/include/wx/gtk/window.h
index c8a7729c8e..90b1a765a7 100644
--- a/include/wx/gtk/window.h
+++ b/include/wx/gtk/window.h
@@ -59,8 +59,6 @@ public:
 
     virtual bool Show( bool show = true );
 
-    virtual void SetWindowStyleFlag( long style );
-
     virtual bool IsRetained() const;
 
     virtual void SetFocus();
diff --git a/src/gtk/window.cpp b/src/gtk/window.cpp
index e88d441af2..e45dd06302 100644
--- a/src/gtk/window.cpp
+++ b/src/gtk/window.cpp
@@ -4407,12 +4407,6 @@ void wxWindowGTK::GTKScrolledWindowSetBorder(GtkWidget* w, int wxstyle)
     }
 }
 
-void wxWindowGTK::SetWindowStyleFlag( long style )
-{
-    // Updates the internal variable. NB: Now m_windowStyle bits carry the _new_ style values already
-    wxWindowBase::SetWindowStyleFlag(style);
-}
-
 // Find the wxWindow at the current mouse position, also returning the mouse
 // position.
 wxWindow* wxFindWindowAtPointer(wxPoint& pt)