diff --git a/include/wx/gtk/window.h b/include/wx/gtk/window.h
index 2fc9d04455..482556b626 100644
--- a/include/wx/gtk/window.h
+++ b/include/wx/gtk/window.h
@@ -152,7 +152,7 @@ class wxWindow: public wxEvtHandler
     
     void OnSysColourChanged( wxSysColourChangedEvent &WXUNUSED(event) ) {};
     
-    virtual bool IsShown(void);
+    virtual bool IsShown(void) const;
     virtual bool IsRetained(void);
     virtual wxWindow *FindWindow( long id );
     virtual wxWindow *FindWindow( const wxString& name );
diff --git a/include/wx/gtk1/window.h b/include/wx/gtk1/window.h
index 2fc9d04455..482556b626 100644
--- a/include/wx/gtk1/window.h
+++ b/include/wx/gtk1/window.h
@@ -152,7 +152,7 @@ class wxWindow: public wxEvtHandler
     
     void OnSysColourChanged( wxSysColourChangedEvent &WXUNUSED(event) ) {};
     
-    virtual bool IsShown(void);
+    virtual bool IsShown(void) const;
     virtual bool IsRetained(void);
     virtual wxWindow *FindWindow( long id );
     virtual wxWindow *FindWindow( const wxString& name );
diff --git a/src/gtk/window.cpp b/src/gtk/window.cpp
index e8f1110306..7726cf9669 100644
--- a/src/gtk/window.cpp
+++ b/src/gtk/window.cpp
@@ -1739,7 +1739,7 @@ wxString wxWindow::GetName(void) const
   return (wxString&)m_windowName;
 };
 
-bool wxWindow::IsShown(void)
+bool wxWindow::IsShown(void) const
 {
   return m_isShown;
 };
@@ -2393,7 +2393,7 @@ void wxWindow::GetPositionConstraint(int *x, int *y) const
     GetPosition(x, y);
 }
 
-void wxWindow::AcceptsFocus() const
+bool wxWindow::AcceptsFocus() const
 {
   return IsEnabled() && IsShown();
 }
diff --git a/src/gtk1/window.cpp b/src/gtk1/window.cpp
index e8f1110306..7726cf9669 100644
--- a/src/gtk1/window.cpp
+++ b/src/gtk1/window.cpp
@@ -1739,7 +1739,7 @@ wxString wxWindow::GetName(void) const
   return (wxString&)m_windowName;
 };
 
-bool wxWindow::IsShown(void)
+bool wxWindow::IsShown(void) const
 {
   return m_isShown;
 };
@@ -2393,7 +2393,7 @@ void wxWindow::GetPositionConstraint(int *x, int *y) const
     GetPosition(x, y);
 }
 
-void wxWindow::AcceptsFocus() const
+bool wxWindow::AcceptsFocus() const
 {
   return IsEnabled() && IsShown();
 }