diff --git a/etc/runonce.d/99-cleanup-sources b/etc/runonce.d/99-cleanup-sources
new file mode 100755
index 0000000..27c7ca9
--- /dev/null
+++ b/etc/runonce.d/99-cleanup-sources
@@ -0,0 +1,5 @@
+#!/bin/bash
+
+cat /etc/apt/sources.list.d/multistrap-*.list >>/etc/apt/sources.list
+rm -f /etc/apt/sources.list.d/multistrap-*.list
+