diff --git a/runtime/syntax/generator/gen_syntax_vim.vim b/runtime/syntax/generator/gen_syntax_vim.vim
index d320bdb..4843aac 100644
--- a/runtime/syntax/generator/gen_syntax_vim.vim
+++ b/runtime/syntax/generator/gen_syntax_vim.vim
@@ -464,6 +464,10 @@
 		let item.type = 'both'
 		call add(a:li, copy(item))
 
+		" "Conceal" is an option and cannot be used as keyword, so remove it.
+		" (Separately specified as 'syn match' in vim.vim.base).
+		call filter(a:li, {idx, val -> val.name !=# 'Conceal'})
+
 		quit!
 
 		if empty(a:li)
diff --git a/runtime/syntax/generator/vim.vim.base b/runtime/syntax/generator/vim.vim.base
index 90e1ee5..7611ef7 100644
--- a/runtime/syntax/generator/vim.vim.base
+++ b/runtime/syntax/generator/vim.vim.base
@@ -70,6 +70,7 @@
 
 " Default highlighting groups {{{2
 " GEN_SYN_VIM: vimHLGroup, START_STR='syn keyword vimHLGroup contained', END_STR=''
+syn match vimHLGroup contained "\<Conceal\>"
 syn case match
 
 " Function Names {{{2