diff --git a/autoload/vimtex/fold/markers.vim b/autoload/vimtex/fold/markers.vim
index ecef7347b41..0ea255f392f 100644
--- a/autoload/vimtex/fold/markers.vim
+++ b/autoload/vimtex/fold/markers.vim
@@ -34,12 +34,18 @@ endfunction
 
 " }}}1
 function! s:folder.level(line, lnum) abort dict " {{{1
-  if a:line =~# self.re.start
+  let l:start = matchlist(a:line, self.re.start .. '\(\d\?\)')
+  let l:end = matchlist(a:line, self.re.end .. '\(\d\?\)')
+  if !empty(l:start)
+    return empty(l:start[1])
+          \ ? 'a1'
+          \ : '>' .. l:start[1]
     let self.opened = 1
-    return 'a1'
-  elseif a:line =~# self.re.end
+  elseif !empty(l:end)
+    return empty(l:end[1])
+          \ ? 's1'
+          \ : '<' .. l:end[1]
     let self.opened = 0
-    return 's1'
   endif
 endfunction