diff --git a/runtime/syntax/debchangelog.vim b/runtime/syntax/debchangelog.vim
index eb02aaf..6e6ed19 100644
--- a/runtime/syntax/debchangelog.vim
+++ b/runtime/syntax/debchangelog.vim
@@ -3,7 +3,7 @@
 " Maintainer:  Debian Vim Maintainers <pkg-vim-maintainers@lists.alioth.debian.org>
 " Former Maintainers: Gerfried Fuchs <alfie@ist.org>
 "                     Wichert Akkerman <wakkerma@debian.org>
-" Last Change: 2016 Nov 12
+" Last Change: 2017 Apr 23
 " URL: https://anonscm.debian.org/cgit/pkg-vim/vim.git/plain/runtime/syntax/debchangelog.vim
 
 " Standard syntax initialization
@@ -14,14 +14,14 @@
 " Case doesn't matter for us
 syn case ignore
 
-let urgency='urgency=\(low\|medium\|high\|critical\)\( [^[:space:],][^,]*\)\='
-let binNMU='binary-only=yes'
+let s:urgency='urgency=\(low\|medium\|high\|critical\)\( [^[:space:],][^,]*\)\='
+let s:binNMU='binary-only=yes'
 
 " Define some common expressions we can use later on
 syn match debchangelogName	contained "^[[:alnum:]][[:alnum:].+-]\+ "
-exe 'syn match debchangelogFirstKV	contained "; \('.urgency.'\|'.binNMU.'\)"'
-exe 'syn match debchangelogOtherKV	contained ", \('.urgency.'\|'.binNMU.'\)"'
-syn match debchangelogTarget	contained "\v %(frozen|unstable|sid|%(testing|%(old)=stable)%(-proposed-updates|-security)=|experimental|squeeze-%(backports%(-sloppy)=|volatile|lts|security)|wheezy-%(backports%(-sloppy)=|security)|jessie%(-backports|-security)=|stretch|%(devel|precise|trusty|vivid|wily|xenial|yakkety|zesty)%(-%(security|proposed|updates|backports|commercial|partner))=)+"
+exe 'syn match debchangelogFirstKV	contained "; \('.s:urgency.'\|'.s:binNMU.'\)"'
+exe 'syn match debchangelogOtherKV	contained ", \('.s:urgency.'\|'.s:binNMU.'\)"'
+syn match debchangelogTarget	contained "\v %(frozen|unstable|sid|%(testing|%(old)=stable)%(-proposed-updates|-security)=|experimental|squeeze-%(backports%(-sloppy)=|volatile|lts|security)|%(wheezy|jessie)%(-backports%(-sloppy)=|-security)=|stretch%(-backports|-security)=|%(devel|precise|trusty|vivid|wily|xenial|yakkety|zesty|artful)%(-%(security|proposed|updates|backports|commercial|partner))=)+"
 syn match debchangelogVersion	contained "(.\{-})"
 syn match debchangelogCloses	contained "closes:\_s*\(bug\)\=#\=\_s\=\d\+\(,\_s*\(bug\)\=#\=\_s\=\d\+\)*"
 syn match debchangelogLP	contained "\clp:\s\+#\d\+\(,\s*#\d\+\)*"