diff --git a/runtime/macros/matchit.vim b/runtime/macros/matchit.vim
index 549c26c..03dae6a 100644
--- a/runtime/macros/matchit.vim
+++ b/runtime/macros/matchit.vim
@@ -808,5 +808,6 @@
 endfun
 
 let &cpo = s:save_cpo
+unlet s:save_cpo
 
 " vim:sts=2:sw=2: