diff --git a/dockerbox.cfg b/dockerbox.cfg
index 6d00a0f..bf1c251 100644
--- a/dockerbox.cfg
+++ b/dockerbox.cfg
@@ -39,6 +39,8 @@ d-i netcfg/hostname string dockerbox
 d-i netcfg/wireless_wep string
 
 ### Mirror settings
+apt-mirror-setup apt-setup/use_mirror boolean true
+
 d-i mirror/https/mirror select deb.debian.org
 d-i mirror/https/directory string /debian/
 d-i mirror/https/proxy string