diff --git a/buildrpms.pl b/buildrpms.pl
index 8a55e448c..fc756a621 100755
--- a/buildrpms.pl
+++ b/buildrpms.pl
@@ -374,6 +374,8 @@ sub buildsources {
     }
 
     if ($pkg eq "xCAT") {
+        cp 'xCAT/xcat-upgrade-functions.sh', "$SOURCES/xcat-upgrade-functions.sh"
+            or die "FATAL: unable to stage upgrade functions: $!\n";
         my @files = ("bmcsetup", "getipmi");
         for my $f (@files) {
             cp "xCAT-genesis-scripts/usr/bin/$f", "$pkg/postscripts/$f";
diff --git a/xCAT/debian/postinst b/xCAT/debian/postinst
index 952bcf235..bbb179ede 100644
--- a/xCAT/debian/postinst
+++ b/xCAT/debian/postinst
@@ -35,7 +35,6 @@ case "$1" in
             if [ -r "/tmp/xcat/mainservice.pid" ]; then
                 mv /tmp/xcat/mainservice.pid /var/run/xcat/mainservice.pid
             fi
-            . /install/postscripts/xcatupgradeutils.sh
             xcat_run_upgrade xcatconfig -u -V
             rm /tmp/xCAT_upgrade.tmp
         else
diff --git a/xCAT/debian/rules b/xCAT/debian/rules
index 89a91529c..170320c1f 100755
--- a/xCAT/debian/rules
+++ b/xCAT/debian/rules
@@ -59,6 +59,12 @@ binary-arch:
 	dh_perl
 	dh_makeshlibs
 	dh_installdeb
+	set -e; scriptfile=debian/xcat/DEBIAN/postinst; \
+	    { head -n 1 "$$scriptfile"; \
+	      cat xcat-upgrade-functions.sh; \
+	      tail -n +2 "$$scriptfile"; } > "$$scriptfile.tmp"; \
+	    chmod 755 "$$scriptfile.tmp"; \
+	    mv "$$scriptfile.tmp" "$$scriptfile"
 	dh_shlibdeps
 	dh_gencontrol -- -Vperl:Depends=perl
 	dh_md5sums
diff --git a/xCAT/xCAT.spec b/xCAT/xCAT.spec
index c0e674b32..ee174a1cb 100644
--- a/xCAT/xCAT.spec
+++ b/xCAT/xCAT.spec
@@ -23,6 +23,7 @@ Source9: xcat-apache-pretrans.lua
 %endif
 
 Source7: xcat.conf.apach24
+Source10: xcat-upgrade-functions.sh
 
 Provides: xCAT = %{version}
 Conflicts: xCATsn
@@ -246,7 +247,8 @@ mkdir -p $RPM_BUILD_ROOT/%{prefix}/share/doc/packages/xCAT
 cp LICENSE.html $RPM_BUILD_ROOT/%{prefix}/share/doc/packages/xCAT
 
 
-%post
+cat %{SOURCE10} > xcat-post.sh
+cat >> xcat-post.sh <<'XCAT_POST'
 %ifos linux
 # On SUSE apache2, mod_headers is not loaded by default; enable it so the
 # security response headers in xcat.conf take effect (a no-op where a2enmod
@@ -285,7 +287,6 @@ if [ -r "/tmp/xcat/mainservice.pid" ]; then
   mv /tmp/xcat/mainservice.pid /var/run/xcat/mainservice.pid
 fi
 
-. /install/postscripts/xcatupgradeutils.sh
 xcat_run_upgrade $RPM_INSTALL_PREFIX0/sbin/xcatconfig -u -V
 
 # rpm has either updated a stock xcat.conf or preserved a modified one and left
@@ -308,6 +309,9 @@ if [ -f "/proc/cmdline" ] && [ "x$(stat -c '%i %d' /)" == "x$(stat -c '%i %d' /p
 fi
 fi
 exit 0
+XCAT_POST
+
+%post -f xcat-post.sh
 
 %clean
 
diff --git a/xCAT/postscripts/xcatupgradeutils.sh b/xCAT/xcat-upgrade-functions.sh
similarity index 100%
rename from xCAT/postscripts/xcatupgradeutils.sh
rename to xCAT/xcat-upgrade-functions.sh