diff --git a/runtime/syntax/vim.vim b/runtime/syntax/vim.vim
index 741ec81..2bf0f7d 100644
--- a/runtime/syntax/vim.vim
+++ b/runtime/syntax/vim.vim
@@ -403,7 +403,7 @@
 
 " Operators: {{{2
 " =========
-syn cluster	vimOperGroup	contains=@vimContinue,@vimExprList,vim9Comment,vimContinueString
+syn cluster	vimOperGroup	contains=@vimContinue,@vimExprList,vim9Comment,vim9LineComment,vimContinueString
 syn match	vimOper	"\a\@<!!"			skipwhite skipnl nextgroup=@vimOperContinue,@vimExprList,vimSpecFile
 syn match	vimOper	"||\|&&\|[-+*/%.]"		skipwhite skipnl nextgroup=@vimOperContinue,@vimExprList,vimSpecFile
 syn match	vimOper	"?"			skipwhite skipnl nextgroup=@vimOperContinue,@vimExprList,vimContinueString