diff --git a/gutenprint-foomaticppdupdate b/gutenprint-foomaticppdupdate
index 53f6a0c..ffee02e 100644
--- a/gutenprint-foomaticppdupdate
+++ b/gutenprint-foomaticppdupdate
@@ -5,8 +5,8 @@
 ## A utility for updating foomatic-generated PPDs so that they work with
 ## a newly-installed gutenprint package.
 
-## Copyright (C) 2007 Red Hat, Inc.
-## Copyright (C) 2007 Tim Waugh <twaugh@redhat.com
+## Copyright (C) 2007, 2009 Red Hat, Inc.
+## Copyright (C) 2007, 2009 Tim Waugh <twaugh@redhat.com
 
 ## This program is free software; you can redistribute it and/or modify
 ## it under the terms of the GNU General Public License as published by
@@ -93,8 +93,15 @@ def update_ppdfile (ppdfile):
         return
 
     # Needs updating.
+    firstdot = gutenprint_version.find ('.')
+    seconddot = firstdot + 1 + gutenprint_version[1 + firstdot:].find ('.')
+    major = gutenprint_version[:seconddot]
+
+    driver = IDs[1]
+    dot = driver.find ('.')
+    driver = driver[:dot] + "." + major
     try:
-        genppd = generate_ppd (ppdfile, IDs[0], IDs[1])
+        genppd = generate_ppd (ppdfile, IDs[0], driver)
     except:
         return
 
diff --git a/gutenprint.spec b/gutenprint.spec
index 9ba2af1..801951f 100644
--- a/gutenprint.spec
+++ b/gutenprint.spec
@@ -4,7 +4,7 @@
 Name:           gutenprint
 Summary:        Printer Drivers Package.
 Version:        5.2.3
-Release:        1%{?dist}
+Release:        2%{?dist}
 Group:          System Environment/Base
 URL:            http://gimp-print.sourceforge.net/
 Source0:        http://dl.sf.net/gimp-print/gutenprint-%{version}.tar.bz2
@@ -246,12 +246,18 @@ exit 0
 
 %post foomatic
 /bin/rm -f /var/cache/foomatic/*
-%{_sbindir}/gutenprint-foomaticppdupdate %{version} || :
+if [ $1 -eq 2 ]; then
+  %{_sbindir}/gutenprint-foomaticppdupdate %{version} || :
+fi
 
 %postun foomatic
 /bin/rm -f /var/cache/foomatic/*
 
 %changelog
+* Thu Jan  8 2009 Tim Waugh <twaugh@redhat.com> 5.2.3-2
+- Only run the foomatic PPD update script on update, and make sure the
+  script can deal with major version upgrades (bug #478328).
+
 * Tue Dec 23 2008 Tim Waugh <twaugh@redhat.com> 5.2.3-1
 - 5.2.3.