diff --git a/src/gtk1/dialog.cpp b/src/gtk1/dialog.cpp
index 90c46a9ff8..007c13df28 100644
--- a/src/gtk1/dialog.cpp
+++ b/src/gtk1/dialog.cpp
@@ -191,9 +191,8 @@ int wxDialog::ShowModal()
     // forbidden
     if ( !GetParent() && !(GetWindowStyleFlag() & wxDIALOG_NO_PARENT) )
     {
-        wxWindow *parent = wxTheApp->GetTopWindow();
         wxWindow * const parent = GetParentForModalDialog();
-        if ( parent && parent != this )
+        if ( parent )
         {
             m_parent = parent;
             gtk_window_set_transient_for( GTK_WINDOW(m_widget), GTK_WINDOW(parent->m_widget) );