diff --git a/helpers/make-nano b/helpers/make-nano
index 61875840..4776206e 100644
--- a/helpers/make-nano
+++ b/helpers/make-nano
@@ -23,15 +23,14 @@
 # or fetch such packages from Debian in order to build the required udeb packages.
 ##
 
-VERSION=1
+VERSION=2
 NETINST=true
 . ./config
 
 # Set version number due to source origin change
-export FULLVERSION="$(sed 's|ubuntu0.1||' <<< $FULLVERSION)"
+export FULLVERSION="$(sed -E 's/^(.*)ubuntu([^+]+)(\+.*)$/\1\3~ubuntu\2/' <<< $FULLVERSION)"
 
 changelog "Fetch and build as udeb dependency for debian-installer."
-head -n1 debian/changelog | grep -q ubuntu && echo "error: update upstream version" && exit
 
 changelog "Rebuild upstream to get udeb dependency for debian-installer."
 package