diff --git a/autoload/openbrowser.vim b/autoload/openbrowser.vim
index 4926c21..902557c 100644
--- a/autoload/openbrowser.vim
+++ b/autoload/openbrowser.vim
@@ -65,3 +65,5 @@ endfunction
 
 
 let &cpo = s:save_cpo
+unlet s:save_cpo
+
diff --git a/autoload/vital/__openbrowser__/OpenBrowser.vim b/autoload/vital/__openbrowser__/OpenBrowser.vim
index be2115f..74ba0cf 100644
--- a/autoload/vital/__openbrowser__/OpenBrowser.vim
+++ b/autoload/vital/__openbrowser__/OpenBrowser.vim
@@ -785,5 +785,6 @@ function! s:_getconcealedcol(expr) abort
   return ret
 endfunction
 
-
 let &cpo = s:save_cpo
+unlet s:save_cpo
+
diff --git a/autoload/vital/__openbrowser__/OpenBrowser/Config.vim b/autoload/vital/__openbrowser__/OpenBrowser/Config.vim
index 7d3aa7c..ba31bc9 100644
--- a/autoload/vital/__openbrowser__/OpenBrowser/Config.vim
+++ b/autoload/vital/__openbrowser__/OpenBrowser/Config.vim
@@ -231,5 +231,6 @@ function! s:default_values() abort
   \}
 endfunction
 
-
 let &cpo = s:save_cpo
+unlet s:save_cpo
+
diff --git a/autoload/vital/__openbrowser__/OpenBrowser/Opener.vim b/autoload/vital/__openbrowser__/OpenBrowser/Opener.vim
index b71faa7..c2830ba 100644
--- a/autoload/vital/__openbrowser__/OpenBrowser/Opener.vim
+++ b/autoload/vital/__openbrowser__/OpenBrowser/Opener.vim
@@ -62,5 +62,6 @@ function! s:_ShellCmdOpener_open() abort dict
   endtry
 endfunction
 
-
 let &cpo = s:save_cpo
+unlet s:save_cpo
+
diff --git a/autoload/vital/_openbrowser/Web/URI.vim b/autoload/vital/_openbrowser/Web/URI.vim
index 504d595..7294aae 100644
--- a/autoload/vital/_openbrowser/Web/URI.vim
+++ b/autoload/vital/_openbrowser/Web/URI.vim
@@ -928,4 +928,7 @@ endfunction
 
 " ================= s:DefaultPatternSet ==================
 
+let &cpo = s:save_cpo
+unlet s:save_cpo
+
 " vim:set et ts=2 sts=2 sw=2 tw=0:fen:
diff --git a/autoload/vital/_openbrowser/Web/URI/HTTP.vim b/autoload/vital/_openbrowser/Web/URI/HTTP.vim
index caf3368..4be5c88 100644
--- a/autoload/vital/_openbrowser/Web/URI/HTTP.vim
+++ b/autoload/vital/_openbrowser/Web/URI/HTTP.vim
@@ -30,4 +30,7 @@ function! s:default_port(uriobj) abort
   return '80'
 endfunction
 
+let &cpo = s:save_cpo
+unlet s:save_cpo
+
 " vim:set et ts=2 sts=2 sw=2 tw=0:fen:
diff --git a/autoload/vital/_openbrowser/Web/URI/HTTPS.vim b/autoload/vital/_openbrowser/Web/URI/HTTPS.vim
index bb23b6a..62aa0a4 100644
--- a/autoload/vital/_openbrowser/Web/URI/HTTPS.vim
+++ b/autoload/vital/_openbrowser/Web/URI/HTTPS.vim
@@ -28,4 +28,7 @@ function! s:default_port(uriobj) abort
   return '443'
 endfunction
 
+let &cpo = s:save_cpo
+unlet s:save_cpo
+
 " vim:set et ts=2 sts=2 sw=2 tw=0:fen:
diff --git a/plugin/openbrowser.vim b/plugin/openbrowser.vim
index 8635ba7..7bc6a9e 100644
--- a/plugin/openbrowser.vim
+++ b/plugin/openbrowser.vim
@@ -81,5 +81,6 @@ if !get(g:, 'openbrowser_no_default_menus', (&guioptions =~# 'M'))
   augroup END
 endif
 
-
 let &cpo = s:save_cpo
+unlet s:save_cpo
+