diff --git a/chardev/baum.c b/chardev/baum.c
index 67fd783a59..78b0c87625 100644
--- a/chardev/baum.c
+++ b/chardev/baum.c
@@ -1,7 +1,7 @@
 /*
  * QEMU Baum Braille Device
  *
- * Copyright (c) 2008, 2010-2011, 2016 Samuel Thibault
+ * Copyright (c) 2008, 2010-2011, 2016-2017 Samuel Thibault
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -239,6 +239,12 @@ static int baum_deferred_init(BaumChardev *baum)
         brlapi_perror("baum: brlapi__getDisplaySize");
         return 0;
     }
+    if (baum->y > 1) {
+        baum->y = 1;
+    }
+    if (baum->x > 84) {
+        baum->x = 84;
+    }
 
     con = qemu_console_lookup_by_index(0);
     if (con && qemu_console_is_graphic(con)) {