diff --git a/autoload/vimtex/env.vim b/autoload/vimtex/env.vim
index 1378e31..327bf73 100644
--- a/autoload/vimtex/env.vim
+++ b/autoload/vimtex/env.vim
@@ -118,8 +118,9 @@ endfunction
 " }}}1
 
 function! vimtex#env#is_inside(env) " {{{1
+  let l:stopline = max([line('.') - 50, 1])
   return searchpair('\\begin\s*{' . a:env . '\*\?}', '',
-        \ '\\end\s*{' . a:env . '\*\?}', 'bnW')
+        \ '\\end\s*{' . a:env . '\*\?}', 'bnW', 0, l:stopline)
 endfunction
 
 " }}}1
diff --git a/indent/tex.vim b/indent/tex.vim
index 2c4188a..b55675a 100644
--- a/indent/tex.vim
+++ b/indent/tex.vim
@@ -80,9 +80,8 @@ endfunction
 
 " }}}1
 function! s:is_verbatim(line, lnum) " {{{1
-  let l:env = a:line !~# '\v\\%(begin|end)\{%(verbatim|lstlisting|minted)'
-  let l:syn = synIDattr(synID(a:lnum, 1, 1), 'name') ==# 'texZone'
-  return l:env && l:syn
+  return a:line !~# '\v\\%(begin|end)\{%(verbatim|lstlisting|minted)'
+        \ && vimtex#env#is_inside('\%(lstlisting\|verbatim\|minted\)')
 endfunction
 
 " }}}1