diff --git a/syntax/markdown.vim b/syntax/markdown.vim
index 96294f6..85e9d53 100644
--- a/syntax/markdown.vim
+++ b/syntax/markdown.vim
@@ -325,7 +325,7 @@ syn match markdownBlockquoteDelimiter /^\s*\%(>\s\?\)\+/ contained
 syn region markdownFencedCodeBlock matchgroup=markdownCodeDelimiter start=/^\s\{,3}```\%(`*\).*$/ end=/^\s\{,3}```\%(`*\)\s*$/ contains=@NoSpell
 syn region markdownFencedCodeBlock matchgroup=markdownCodeDelimiter start=/^\s\{,3}\~\~\~\%(\~*\).*$/ end=/^\s\{,3}\~\~\~\%(\~*\)\s*$/ contains=@NoSpell
 
-syn match markdownCodeBlock /\%(^\n\)\@<=\%(\%(\s\{4,}\|\t\+\).*\n\)\+$/ contains=@NoSpell
+syn match markdownCodeBlock /\%(^\n\)\@<=\%(\%( \{4}\|\t\+\).*\n\)\+$/ contains=@NoSpell
 
 let s:markdown_table_header_rows_separator = ''
   \ . '\%('