diff --git a/sw/ground_segment/tmtc/messages.ml b/sw/ground_segment/tmtc/messages.ml
index 07c99c2fe74..238fba7c3f0 100644
--- a/sw/ground_segment/tmtc/messages.ml
+++ b/sw/ground_segment/tmtc/messages.ml
@@ -204,6 +204,7 @@ let _ =
   (** Open the window container with its notebook*)
   let icon = GdkPixbuf.from_file Env.icon_mes_file in
   let window = GWindow.window ~type_hint:`DIALOG ~icon ~title:"Messages" () in
+  window#set_default_size ~width:200 ~height:50;
   let quit = fun () -> GMain.Main.quit (); exit 0 in
   ignore (window#connect#destroy ~callback:quit);