diff --git a/packages/debian/postinst b/packages/debian/postinst
new file mode 100755
index 0000000..d23e6bc
--- /dev/null
+++ b/packages/debian/postinst
@@ -0,0 +1,4 @@
+#!/bin/bash
+
+# remove old cache file
+[ -f /var/cache/sanoidsnapshots.txt ] && rm /var/cache/sanoidsnapshots.txt