diff --git a/liboil-0.3.13-disable-ppc64-opts.patch b/liboil-0.3.13-disable-ppc64-opts.patch
new file mode 100644
index 0000000..9e0cdc6
--- /dev/null
+++ b/liboil-0.3.13-disable-ppc64-opts.patch
@@ -0,0 +1,29 @@
+--- configure.old	2008-03-12 17:30:29.000000000 +0000
++++ configure	2008-03-12 17:34:06.000000000 +0000
+@@ -10534,7 +10534,7 @@ cat >>confdefs.h <<\_ACEOF
+ _ACEOF
+ 
+       ;;
+-    xpowerpc|xppc|xpowerpc64|xppc64)
++    xpowerpc|xppc)
+       HAVE_POWERPC=yes
+ 
+ cat >>confdefs.h <<\_ACEOF
+@@ -10631,7 +10631,7 @@ eval "echo \"\$as_me:$LINENO: $ac_try_ec
+ 	 test -z "$ac_c_werror_flag" ||
+ 	 test ! -s conftest.err
+        } && test -s conftest.$ac_objext; then
+-  flag_ok=yes
++  flag_ok=no
+ else
+   echo "$as_me: failed program was:" >&5
+ sed 's/^/| /' conftest.$ac_ext >&5
+@@ -10641,7 +10641,7 @@ fi
+ 
+ rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+ 
+-  if test "X$flag_ok" = Xyes ; then
++  if test "X$flag_ok" = Xyes -a "X$HAVE_POWERPC" = "Xyes" ; then
+     HAVE_GCC_ASM_POWERPC_FPU=yes
+     true
+   else
diff --git a/liboil.spec b/liboil.spec
index 40d556e..8d33591 100644
--- a/liboil.spec
+++ b/liboil.spec
@@ -1,7 +1,7 @@
 Summary: Library of Optimized Inner Loops, CPU optimized functions
 Name: liboil
 Version: 0.3.13
-Release: 5%{?dist}
+Release: 6%{?dist}
 # See COPYING which details everything, various BSD licenses apply
 License: BSD
 Group: System Environment/Libraries
@@ -12,6 +12,8 @@ Patch1: liboil-0.3.13-s390.patch
 Patch2: liboil-0.3.13-better-altivec-detect.patch
 # from upstream git
 Patch3: clobber-ecx.patch
+# https://bugzilla.redhat.com/show_bug.cgi?id=435771
+Patch4: liboil-0.3.13-disable-ppc64-opts.patch
 
 BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root
 BuildRequires: glib2-devel
@@ -43,6 +45,7 @@ extended instructions provided by modern CPUs (Altivec, MMX, SSE, etc.).
 %patch1 -p1 -b .s390
 %patch2 -p0 -b .better-altivec-detect
 %patch3 -p1 -b .clobber-ecx
+%patch4 -p0 -b .disable-ppc64-opts
 
 # Disable Altivec, so that liboil doesn't SIGILL on non-Altivec PPCs
 # See https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=252179#c15
@@ -90,6 +93,9 @@ rm -rf %{buildroot}
 
 
 %changelog
+* Wed Mar 12 2008 - Bastien Nocera <bnocera@redhat.com> - 0.3.13-6
+- Disable PPC64 optimisations as rgb2bgr_ppc() crashes on 64-bit
+
 * Tue Mar 11 2008 - Bastien Nocera <bnocera@redhat.com> - 0.3.13-5
 - Detect Altivec using /proc instead of causing a SIGILL fault