diff --git a/lcl/interfaces/gtk2/gtk2winapi.inc b/lcl/interfaces/gtk2/gtk2winapi.inc
index bb735d1287..625979026e 100644
--- a/lcl/interfaces/gtk2/gtk2winapi.inc
+++ b/lcl/interfaces/gtk2/gtk2winapi.inc
@@ -9477,6 +9477,7 @@ begin
           gtk_widget_show(PGtkWidget(GtkWindow));
         gtk_window_deiconify(GtkWindow);
         gtk_window_unmaximize(GtkWindow);
+        gtk_window_unfullscreen(GtkWindow);
       end;
     end;