diff --git a/day01-image/files/etc/cloud/cloud.cfg b/day01-image/files/etc/cloud/cloud.cfg
index c3cbb03..94b618d 100644
--- a/day01-image/files/etc/cloud/cloud.cfg
+++ b/day01-image/files/etc/cloud/cloud.cfg
@@ -4,6 +4,7 @@
 
 # This will cause the set+update hostname module to not operate (if true)
 preserve_hostname: false
+apt_preserve_sources_list: true
 
 # Better let managing of /etc/hosts on salt and others
 # manage_etc_hosts: localhost