diff --git a/mozilla/widget/src/gtk/nsWidget.cpp b/mozilla/widget/src/gtk/nsWidget.cpp
index 46acad0f106..fafec497641 100644
--- a/mozilla/widget/src/gtk/nsWidget.cpp
+++ b/mozilla/widget/src/gtk/nsWidget.cpp
@@ -245,22 +245,6 @@ NS_METHOD nsWidget::Show(PRBool bState)
   return NS_OK;
 }
 
-NS_METHOD nsWidget::SetModal(void)
-{
-  GtkWindow *toplevel;
-
-  if (!mWidget)
-    return NS_ERROR_FAILURE;
-
-  toplevel = (GtkWindow *) ::gtk_widget_get_toplevel (mWidget);
-  if (!toplevel)
-    return NS_ERROR_FAILURE;
-
-  ::gtk_window_set_modal(toplevel, PR_TRUE);
-
-  return NS_OK;
-}
-
 NS_METHOD nsWidget::IsVisible(PRBool &aState)
 {
     if (mWidget) {