diff --git a/src/gtk/dialog.cpp b/src/gtk/dialog.cpp
index 42360a0613..703e8320c6 100644
--- a/src/gtk/dialog.cpp
+++ b/src/gtk/dialog.cpp
@@ -387,7 +387,7 @@ void wxDialog::OnPaint( wxPaintEvent& WXUNUSED(event) )
     // yes
 }
 
-void wxDialog::OnCloseWindow(wxCloseEvent& event)
+void wxDialog::OnCloseWindow(wxCloseEvent& WXUNUSED(event))
 {
     // We'll send a Cancel message by default,
     // which may close the dialog.
diff --git a/src/gtk1/dialog.cpp b/src/gtk1/dialog.cpp
index 42360a0613..703e8320c6 100644
--- a/src/gtk1/dialog.cpp
+++ b/src/gtk1/dialog.cpp
@@ -387,7 +387,7 @@ void wxDialog::OnPaint( wxPaintEvent& WXUNUSED(event) )
     // yes
 }
 
-void wxDialog::OnCloseWindow(wxCloseEvent& event)
+void wxDialog::OnCloseWindow(wxCloseEvent& WXUNUSED(event))
 {
     // We'll send a Cancel message by default,
     // which may close the dialog.