diff --git a/microcode_ctl.spec b/microcode_ctl.spec
index bcc3009..367477b 100644
--- a/microcode_ctl.spec
+++ b/microcode_ctl.spec
@@ -57,12 +57,24 @@ chmod -R a-s %{buildroot}
 /sbin/microcode_ctl
 %attr(0644,root,root) %{_mandir}/*/*
 
+
+
 %preun
 if [ "$1" = "0" ] ; then
- /sbin/chkconfig --del microcode_ctl
+	/sbin/chkconfig --del microcode_ctl
 fi
 
 %post
+# Only enable on Intel machines.
+vendor=`cat /proc/cpuinfo | grep "^vendor_id" | sort -u | awk -F ": " '{ print $2 }'`
+if [ "$vendor" != "GenuineIntel" ]; then
+	exit 0;
+fi
+# Microcode wasn't available until 686's.
+family=`cat /proc/cpuinfo | grep "^cpu family" | sort -u | awk -F ": " '{ print $2 }'`
+if [ $family -lt 6 ]; then
+	exit 0;
+fi
 /sbin/chkconfig --add microcode_ctl
 
 %triggerpostun -- kernel-utils
@@ -70,6 +82,9 @@ fi
 exit 0
 
 %changelog
+* Fri Jan 14 2005 Dave Jones <davej@redhat.com>
+- Only enable microcode_ctl service if the CPU is capable.
+
 * Wed Jan 12 2005 Dave Jones <davej@redhat.com>
 - Adjust dev node location. (#144963)