diff --git a/ghostscript.spec b/ghostscript.spec
index 02a1c27..63e182f 100644
--- a/ghostscript.spec
+++ b/ghostscript.spec
@@ -19,6 +19,7 @@ Patch2: ghostscript-scripts.patch
 Patch3: ghostscript-noopt.patch
 Patch4: ghostscript-big-cmap-post.patch
 Patch5: ghostscript-split-cidfnmap.patch
+Patch6: ghostscript-gxcht-64bit-crash.patch
 
 Requires: urw-fonts >= 1.1, ghostscript-fonts
 BuildRequires: libjpeg-devel, libXt-devel
@@ -87,6 +88,9 @@ A GTK-enabled version of Ghostscript, called 'gsx'.
 # Support CIDFnmap inclusion from other files (bug #194592).
 %patch5 -p1 -b .split-cidfnmap
 
+# Backported gxcht 64bit crash fix from GPL trunk (bug #177763).
+%patch6 -p1 -b .gxcht-64bit-crash
+
 # Convert manual pages to UTF-8
 from8859_1() {
 	iconv -f iso-8859-1 -t utf-8 < "$1" > "${1}_"
@@ -242,6 +246,9 @@ rm -rf $RPM_BUILD_ROOT
 %{_libdir}/libijs.*a
 
 %changelog
+* Thu Jan 18 2007 Tim Waugh <twaugh@redhat.com>
+- Backported gxcht 64bit crash fix from GPL trunk (bug #177763).
+
 * Fri Jan 12 2007 Tim Waugh <twaugh@redhat.com> 8.15.3-4
 - Own cjkv directory (bug #221380, bug #222375).