diff --git a/debian/login.postinst b/debian/login.postinst
index 8f3ef552..2261e1b6 100644
--- a/debian/login.postinst
+++ b/debian/login.postinst
@@ -5,23 +5,23 @@ set -e
 
 if [ "$1" = "configure" ]; then
 	# Install faillog during initial installs only
-	if [ "$2" = "" ] && [ ! -f /var/log/faillog ] ; then
-		touch /var/log/faillog
-		chown root:root /var/log/faillog
-		chmod 644 /var/log/faillog
+	if [ "$2" = "" ] && [ ! -f "$DPKG_ROOT/var/log/faillog" ] ; then
+		touch "$DPKG_ROOT/var/log/faillog"
+		chown 0:0 "$DPKG_ROOT/var/log/faillog"
+		chmod 644 "$DPKG_ROOT/var/log/faillog"
 	fi
 
 	# Create subuid/subgid if missing
-	if [ ! -e /etc/subuid ]; then
-		touch /etc/subuid
-		chown root:root /etc/subuid
-		chmod 644 /etc/subuid
+	if [ ! -e "$DPKG_ROOT/etc/subuid" ]; then
+		touch "$DPKG_ROOT/etc/subuid"
+		chown 0:0 "$DPKG_ROOT/etc/subuid"
+		chmod 644 "$DPKG_ROOT/etc/subuid"
 	fi
 
-	if [ ! -e /etc/subgid ]; then
-		touch /etc/subgid
-		chown root:root /etc/subgid
-		chmod 644 /etc/subgid
+	if [ ! -e "$DPKG_ROOT/etc/subgid" ]; then
+		touch "$DPKG_ROOT/etc/subgid"
+		chown 0:0 "$DPKG_ROOT/etc/subgid"
+		chmod 644 "$DPKG_ROOT/etc/subgid"
 	fi
 fi