diff --git a/runtime/ftplugin/ant.vim b/runtime/ftplugin/ant.vim
index 648fca1..5905858 100644
--- a/runtime/ftplugin/ant.vim
+++ b/runtime/ftplugin/ant.vim
@@ -41,3 +41,4 @@
 
 " Restore the saved compatibility options.
 let &cpo = s:save_cpo
+unlet s:save_cpo