--- old-nginx.vim	2021-11-08 09:37:42.011999638 +0100
+++ syntax/nginx.vim	2021-11-08 09:34:10.923999664 +0100
@@ -5,6 +5,10 @@
   finish
 end
 
+" Reset compatible-options to Vim default value, just in case: 
+let s:save_cpo = &cpo
+set cpo&vim
+
 " general syntax
 
 if has("patch-7.4.1142")
@@ -2447,4 +2451,8 @@
 hi def link ngxListenOptions Keyword
 hi def link ngxListenOptionsDeprecated Error
 
+" Restore current compatible-options:
+let &cpo = s:save_cpo
+unlet s:save_cpo
+
 let b:current_syntax = "nginx"