diff --git a/simple-cdd/profiles/offline.downloads b/simple-cdd/profiles/offline.downloads
index 0caad6b..6b01884 100644
--- a/simple-cdd/profiles/offline.downloads
+++ b/simple-cdd/profiles/offline.downloads
@@ -1,3 +1,5 @@
+# Add packages required by debootstrap (cf. #51)
+usr-is-merged
 # Add packages required for virtualization support (installed by
 # /usr/lib/finish-install.d/08hw-detect) including their recommends
 hyperv-daemons