diff --git a/usr/lib/security-misc/apt-get-update-sanity-test b/usr/lib/security-misc/apt-get-update-sanity-test
new file mode 100755
index 0000000..6ac93a5
--- /dev/null
+++ b/usr/lib/security-misc/apt-get-update-sanity-test
@@ -0,0 +1,12 @@
+#!/bin/bash
+
+## This file is part of Whonix.
+## Copyright (C) 2012 - 2014 Patrick Schleizer <adrelanos@riseup.net>
+## See the file COPYING for copying conditions.
+
+set -x
+set -e
+set -o pipefail
+
+wc -L "/var/lib/apt/lists/"*InRelease
+wc -L "/var/lib/apt/lists/"*InRelease | awk '$1 > 1024 {print; exit 1}'