diff --git a/tbb-2.2-mfence.patch b/tbb-2.2-mfence.patch
new file mode 100644
index 0000000..e8b08e6
--- /dev/null
+++ b/tbb-2.2-mfence.patch
@@ -0,0 +1,20 @@
+diff -up /home/petr/fedora/tbb/devel/tbb22_20090809oss-pm/include/tbb/machine/linux_ia32.h\~ /home/petr/fedora/tbb/devel/tbb22_20090809oss-pm/include/tbb/machine/linux_ia32.h
+--- tbb22_20090809oss-pm/include/tbb/machine/linux_ia32.h~	2009-08-12 09:05:03.000000000 +0200
++++ tbb22_20090809oss-pm/include/tbb/machine/linux_ia32.h	2010-06-10 17:11:17.000000000 +0200
+@@ -39,7 +39,13 @@
+ 
+ #define __TBB_release_consistency_helper() __asm__ __volatile__("": : :"memory")
+ 
+-inline void __TBB_rel_acq_fence() { __asm__ __volatile__("mfence": : :"memory"); }
++inline void __TBB_rel_acq_fence() {
++  int tmp;
++  __asm__ __volatile__("xchg %0,%0"
++		       : "=r"(tmp)
++		       : "r"(tmp)
++		       : "memory");
++}
+ 
+ #define __MACHINE_DECL_ATOMICS(S,T,X) \
+ static inline T __TBB_machine_cmpswp##S (volatile void *ptr, T value, T comparand )  \
+
+Diff finished.  Thu Jun 10 17:13:43 2010
diff --git a/tbb.spec b/tbb.spec
index 805598b..8b15aee 100644
--- a/tbb.spec
+++ b/tbb.spec
@@ -11,7 +11,7 @@
 Summary: The Threading Building Blocks library abstracts low-level threading details
 Name: tbb
 Version: %{major}.%{minor}
-Release: 1.%{releasedate}%{?dist}
+Release: 2.%{releasedate}%{?dist}
 License: GPLv2 with exceptions
 Group: Development/Tools
 URL: http://threadingbuildingblocks.org/
@@ -26,6 +26,7 @@ Source2: %{source_2}
 Source3: %{source_3}
 Source4: %{source_4}
 Patch1: tbb-2.2-20090809-cxxflags.patch
+Patch2: tbb-2.2-mfence.patch
 BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
 BuildRequires: libstdc++-devel
 # We need "arch" and "hostname" binaries:
@@ -66,6 +67,7 @@ C++ library.
 %prep
 %setup -q -n %{sourcebasename}
 %patch1 -p1
+%patch2 -p1
 
 %build
 make %{?_smp_mflags} CXXFLAGS="$RPM_OPT_FLAGS" tbb_build_prefix=obj
@@ -115,6 +117,11 @@ rm -rf ${RPM_BUILD_ROOT}
 %doc %{source_4}
 
 %changelog
+* Thu Jun 10 2010 Petr Machata <pmachata@redhat.com> - 2.2-2.20090809
+- Replace mfence instruction with xchg to make it run on ia32-class
+  machines without SSE2.
+- Resolves: #600654
+
 * Tue Nov  3 2009 Petr Machata <pmachata@redhat.com> - 2.2-1.20090809
 - New upstream 2.2
 - Resolves: #521571