diff --git a/runtime/ftplugin/tcsh.vim b/runtime/ftplugin/tcsh.vim
index dacb44e..7e2d959 100644
--- a/runtime/ftplugin/tcsh.vim
+++ b/runtime/ftplugin/tcsh.vim
@@ -37,3 +37,4 @@
 
 " Restore the saved compatibility options.
 let &cpo = s:save_cpo
+unlet s:save_cpo