diff --git a/enscript-bufpos-crash.patch b/enscript-bufpos-crash.patch
new file mode 100644
index 0000000..60417ee
--- /dev/null
+++ b/enscript-bufpos-crash.patch
@@ -0,0 +1,12 @@
+diff -up enscript-1.6.5.2/src/psgen.c.bufpos-crash enscript-1.6.5.2/src/psgen.c
+--- enscript-1.6.5.2/src/psgen.c.bufpos-crash	2013-05-13 16:18:05.119393660 +0100
++++ enscript-1.6.5.2/src/psgen.c	2013-05-13 16:19:17.634739778 +0100
+@@ -1928,7 +1928,7 @@ get_next_token (InputStream *is, double
+ 			  bufpos--;
+ 			}
+ 		      /* Check the octal notations "\\%03o". */
+-		      else if (bufpos - 2 > w
++		      else if (bufpos > 2 && bufpos - 2 > w
+ 			       && ISOCTAL (buffer[bufpos])
+ 			       && ISOCTAL (buffer[bufpos - 1])
+ 			       && ISOCTAL (buffer[bufpos - 2])
diff --git a/enscript.spec b/enscript.spec
index edd31e9..2e1bba5 100644
--- a/enscript.spec
+++ b/enscript.spec
@@ -1,7 +1,7 @@
 Summary: A plain ASCII to PostScript converter
 Name: enscript
 Version: 1.6.5.2
-Release: 5%{?dist}
+Release: 6%{?dist}
 License: GPLv3+
 Group: Applications/Publishing
 URL: http://www.gnu.org/software/enscript
@@ -25,6 +25,7 @@ Patch8: enscript-wrap_header.patch
 Patch9: enscript-1.6.4-rh457719.patch
 Patch10:enscript-1.6.4-rh457720.patch
 Patch12:enscript-rh477382.patch
+Patch13: enscript-bufpos-crash.patch
 Requires(preun): /sbin/install-info
 Requires(post): /sbin/install-info
 BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
@@ -49,6 +50,7 @@ includes many options for customizing printouts
 %patch9 -p1 -b .rh457719
 %patch10 -p1 -b .rh457720
 %patch12 -p1 -b .rh477382
+%patch13 -p1 -b .bufpos-crash
 
 %{__tar} -C states/hl -zxf %{SOURCE1} ruby.st
 install -pm 644 %{SOURCE2} states/hl/php.st
@@ -109,6 +111,9 @@ fi
 %config(noreplace) %{_sysconfdir}/enscript.cfg
 
 %changelog
+* Mon May 13 2013 Tim Waugh <twaugh@redhat.com> - 1.6.5.2-6
+- Fixed word-wrapping crash in tokenizer (bug #870639).
+
 * Fri Jan 13 2012 Fedora Release Engineering <rel-eng@lists.fedoraproject.org> - 1.6.5.2-5
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_17_Mass_Rebuild