diff --git a/runtime/syntax/cmake.vim b/runtime/syntax/cmake.vim
index d6e8cb4..e241605e 100644
--- a/runtime/syntax/cmake.vim
+++ b/runtime/syntax/cmake.vim
@@ -18,6 +18,8 @@
 elseif exists("b:current_syntax")
   finish
 endif
+let s:keepcpo= &cpo
+set cpo&vim
 
 syn case ignore
 syn match cmakeEscaped /\(\\\\\|\\"\|\\n\|\\t\)/ contained
@@ -78,4 +80,7 @@
 
 let b:current_syntax = "cmake"
 
+let &cpo = s:keepcpo
+unlet s:keepcpo
+
 "EOF"