diff --git a/runtime/compiler/cs.vim b/runtime/compiler/cs.vim
index 4f6dd3c..123dff8 100644
--- a/runtime/compiler/cs.vim
+++ b/runtime/compiler/cs.vim
@@ -3,6 +3,7 @@
 " Maintainer:             Yichao Zhou (broken.zhou@gmail.com)
 " Previous Maintainer:    Joseph H. Yao (hyao@sina.com)
 " Last Change:            Jul 22, 2019
+"                         2024 Apr 03 by The Vim Project (removed :CompilerSet definition)
 
 if exists("current_compiler")
   finish
@@ -11,10 +12,6 @@
 let s:keepcpo= &cpo
 set cpo&vim
 
-if exists(":CompilerSet") != 2		" older Vim always used :setlocal
-  command -nargs=* CompilerSet setlocal <args>
-endif
-
 CompilerSet errorformat&
 CompilerSet errorformat+=%f(%l\\,%v):\ %t%*[^:]:\ %m,
             \%trror%*[^:]:\ %m,