diff --git a/util/postinstall.sh.in b/util/postinstall.sh.in
index f6c276ba..c806600f 100755
--- a/util/postinstall.sh.in
+++ b/util/postinstall.sh.in
@@ -13,8 +13,6 @@ CRON_ORIG="/tmp/crontab.piler.orig"
 CRON_TMP="/tmp/crontab.piler"
 PILERCONF_TMP="/tmp/config.piler.88"
 SOCKET_HELPER_SCRIPT="aaa.pl"
-PILER_CONFIG_DIR="${SYSCONFDIR}/piler"
-CONFIG_SITE_PHP="${PILER_CONFIG_DIR}/config-site.php"
 
 load_default_values() {
    PILERUSER="piler"
@@ -23,6 +21,9 @@ load_default_values() {
    LIBEXECDIR=__LIBEXECDIR
    DATAROOTDIR=__DATAROOTDIR
 
+   PILER_CONFIG_DIR="${SYSCONFDIR}/piler"
+   CONFIG_SITE_PHP="${PILER_CONFIG_DIR}/config-site.php"
+
    KEYTMPFILE="piler.key"
    KEYFILE="${PILER_CONFIG_DIR}/piler.key"