diff --git a/filesystem.spec b/filesystem.spec
index dbed424..e41a8b5 100644
--- a/filesystem.spec
+++ b/filesystem.spec
@@ -1,7 +1,7 @@
 Summary: The basic directory layout for a Linux system
 Name: filesystem
 Version: 3
-Release: 1%{?dist}
+Release: 2%{?dist}
 License: Public Domain
 URL: https://fedorahosted.org/filesystem
 Group: System Environment/Base
@@ -12,9 +12,9 @@ Source3: iso_3166.sed
 BuildRequires: iso-codes
 Requires(pre): setup
 
-# old installations; this ensures we can not install the incompatible
-# filesystem.rpm on unconverted systems
-#Requires: rpmlib(X-CheckUnifiedSystemdir) >= 1
+# RPM runtime check in the buildroot; this ensures we can not install the
+# incompatible filesystem.rpm on unconverted systems
+Requires: rpmlib(X-CheckUnifiedSystemdir)
 
 %description
 The filesystem package is one of the basic packages that is installed
@@ -227,6 +227,10 @@ posix.symlink("../run/lock", "/var/lock")
 /var/yp
 
 %changelog
+* Fri Feb  3 2012 Kay Sievers <kay@redhat.com> 3-2
+- enable guard against unconverted /bin, /sbin, /lib*
+  directories in the filesystem
+
 * Wed Jan 25 2012 Harald Hoyer <harald@redhat.com> 3-1
 - install everything in /usr
   https://fedoraproject.org/wiki/Features/UsrMove