diff --git a/ORBit2.spec b/ORBit2.spec
index 4dcbc1c..4983258 100644
--- a/ORBit2.spec
+++ b/ORBit2.spec
@@ -4,7 +4,7 @@
 Summary: A high-performance CORBA Object Request Broker
 Name: ORBit2
 Version: 2.14.19
-Release: 10%{?dist}
+Release: 11%{?dist}
 #VCS: git:git://git.gnome.org/ORBit2
 Source: http://download.gnome.org/sources/ORBit2/2.14/%{name}-%{version}.tar.bz2
 Group: System Environment/Daemons
@@ -81,7 +81,7 @@ rm -f $RPM_BUILD_ROOT%{_libdir}/ORBit-2.0/*.*a
 rm -f $RPM_BUILD_ROOT%{_libdir}/orbit-2.0/*.*a
 
 # fix multilib conflict caused by orbit-config.h
-%define wordsize %{_isa_bits}
+%define wordsize %{__isa_bits}
 
 mv $RPM_BUILD_ROOT%{_includedir}/orbit-2.0/orbit/orbit-config.h \
    $RPM_BUILD_ROOT%{_includedir}/orbit-2.0/orbit/orbit-config-%{wordsize}.h
@@ -131,6 +131,9 @@ EOF
 %{_datadir}/gtk-doc
 
 %changelog
+* Tue Dec 10 2013 Petr Pisar <ppisar@redhat.com> - 2.14.19-11
+- Correct __isa_bits macro name
+
 * Thu Dec  5 2013 Peter Robinson <pbrobinson@fedoraproject.org> 2.14.19-10
 - Simplify wordsize definition (fix FTBFS on aarch64)