diff --git a/debian/preinst b/debian/preinst
new file mode 100644
index 0000000..7e9f04d
--- /dev/null
+++ b/debian/preinst
@@ -0,0 +1,35 @@
+#!/bin/sh
+# preinst script for eole-redis
+#
+# see: dh_installdeb(1)
+
+set -e
+
+# summary of how this script can be called:
+#        * <new-preinst> `install'
+#        * <new-preinst> `install' <old-version>
+#        * <new-preinst> `upgrade' <old-version>
+#        * <old-preinst> `abort-upgrade' <new-version>
+# for details, see https://www.debian.org/doc/debian-policy/ or
+# the debian-policy package
+
+case "$1" in
+    install|upgrade)
+        deb-systemd-helper mask redis-server.service
+    ;;
+
+    abort-upgrade)
+    ;;
+
+    *)
+        echo "preinst called with unknown argument \`$1'" >&2
+        exit 1
+    ;;
+esac
+
+# dh_installdeb will replace this with shell code automatically
+# generated by other debhelper scripts.
+
+#DEBHELPER#
+
+exit 0
diff --git a/debian/source/.format.un~ b/debian/source/.format.un~
deleted file mode 100644
index 8ec6bc1..0000000
Binary files a/debian/source/.format.un~ and /dev/null differ