diff --git a/qemu-fix-extboot-signrom.patch b/qemu-fix-extboot-signrom.patch
new file mode 100644
index 0000000..1829d9d
--- /dev/null
+++ b/qemu-fix-extboot-signrom.patch
@@ -0,0 +1,44 @@
+From 6fb154d7d16b25d70615d33dc30927ded148dd32 Mon Sep 17 00:00:00 2001
+From: Alexander Graf <agraf@suse.de>
+Date: Sat, 1 Aug 2009 11:48:31 +0200
+Subject: [PATCH] Fix checksum writing in signboot.sh
+
+The printf command takes an octal value after \, so we have to convert
+our decimal representation to octal first and then write it.
+
+This unbreaks extboot signing. Multiboot wasn't affected yet because
+the checksum was < 8.
+
+Spotted and first patch by Glauber Costa <glommer@redhat.com>.
+Printf idea by Paolo Bonzini <bonzini@gnu.org>.
+
+(cherry picked from commit d8b69b34761f7b3fb8f476712b631d1dd3f1b2a5)
+
+Signed-off-by: Alexander Graf <agraf@suse.de>
+CC: Glauber Costa <glommer@redhat.com>
+CC: Paolo Bonzini <bonzini@gnu.org>
+CC: Jan Ondrej <ondrejj@salstar.sk>
+Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
+Signed-off-by: Mark McLoughlin <markmc@redhat.com>
+Fedora-patch: qemu-fix-extboot-signrom.patch
+---
+ pc-bios/optionrom/signrom.sh |    3 ++-
+ 1 files changed, 2 insertions(+), 1 deletions(-)
+
+diff --git a/pc-bios/optionrom/signrom.sh b/pc-bios/optionrom/signrom.sh
+index 4322811..975b27d 100755
+--- a/pc-bios/optionrom/signrom.sh
++++ b/pc-bios/optionrom/signrom.sh
+@@ -39,7 +39,8 @@ done
+ 
+ sum=$(( $sum % 256 ))
+ sum=$(( 256 - $sum ))
++sum_octal=$( printf "%o" $sum )
+ 
+ # and write the output file
+ cp "$1" "$2"
+-printf "\\$sum" | dd of="$2" bs=1 count=1 seek=$size conv=notrunc 2>/dev/null
++printf "\\$sum_octal" | dd of="$2" bs=1 count=1 seek=$size conv=notrunc 2>/dev/null
+-- 
+1.6.2.5
+
diff --git a/qemu.spec b/qemu.spec
index 9b6ad25..b393896 100644
--- a/qemu.spec
+++ b/qemu.spec
@@ -4,7 +4,7 @@
 Summary: QEMU is a FAST! processor emulator
 Name: qemu
 Version: 0.10.91
-Release: 0.2.%{kvmvertag}%{?dist}
+Release: 0.3.%{kvmvertag}%{?dist}
 # Epoch because we pushed a qemu-1.0 package
 Epoch: 2
 License: GPLv2+ and LGPLv2+ and BSD
@@ -29,6 +29,9 @@ Patch03: qemu-fix-optionrom-install.patch
 # Add KSM support - see https://fedoraproject.org/wiki/Features/KSM
 Patch04: qemu-add-ksm-support.patch
 
+# Fix extboot checksum (bug #514899)
+Patch05: qemu-fix-extboot-signrom.patch
+
 BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
 BuildRequires: SDL-devel zlib-devel which texi2html gnutls-devel cyrus-sasl-devel
 BuildRequires: rsync dev86 iasl
@@ -213,6 +216,7 @@ such as kvmtrace and kvm_stat.
 %patch02 -p1
 %patch03 -p1
 %patch04 -p1
+%patch05 -p1
 
 %build
 # systems like rhel build system does not have a recent enough linker so
@@ -477,6 +481,9 @@ getent passwd qemu >/dev/null || \
 %{_mandir}/man1/qemu-img.1*
 
 %changelog
+* Tue Aug  4 2009 Mark McLoughlin <markmc@redhat.com> - 2:0.10.91-0.3.rc1.rc0
+- Fix extboot checksum (bug #514899)
+
 * Fri Jul 31 2009 Mark McLoughlin <markmc@redhat.com> - 2:0.10.91-0.2.rc1.rc0
 - Add KSM support
 - Require bochs-bios >= 2.3.8-0.8 for latest kvm bios updates