diff --git a/configure.ac b/configure.ac
index be114145..7f3bd764 100644
--- a/configure.ac
+++ b/configure.ac
@@ -7,7 +7,7 @@ dnl This program is distributed under the terms of the GPL v2.0
 dnl Download the GNU Public License (GPL) from www.gnu.org
 dnl
 
-AC_INIT([smallbasic], [0.11.12])
+AC_INIT([smallbasic], [0.11.13])
 AC_CONFIG_SRCDIR([configure.ac])
 
 AC_CANONICAL_TARGET
diff --git a/debian/changelog b/debian/changelog
index fe007f3c..cb8e5bbe 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,8 @@
+smallbasic (0.11.13) unstable; urgency=low
+  * Fixed UDS handling
+
+ -- Chris Warren-Smith <cwarrensmith@gmail.com>  Sun, 24 August 2014 09:45:25 +1000
+
 smallbasic (0.11.12) unstable; urgency=low
   * Fixed/implemented INCLUDE command
 
diff --git a/src/platform/fltk/dev_fltk.cxx b/src/platform/fltk/dev_fltk.cxx
index b39c3f70..5b18f171 100644
--- a/src/platform/fltk/dev_fltk.cxx
+++ b/src/platform/fltk/dev_fltk.cxx
@@ -96,6 +96,10 @@ int osd_devinit() {
 
   os_graf_mx = wnd->_out->w();
   os_graf_my = wnd->_out->h();
+
+  setsysvar_int(SYSVAR_XMAX, os_graf_mx - 1);
+  setsysvar_int(SYSVAR_YMAX, os_graf_my - 1);
+
   os_color_depth = 32;
   if (SharedImage::first_image) {
     SharedImage::first_image->clear_cache();