diff --git a/autoload/vimtex/toc.vim b/autoload/vimtex/toc.vim
index 274a268..b753584 100644
--- a/autoload/vimtex/toc.vim
+++ b/autoload/vimtex/toc.vim
@@ -58,7 +58,7 @@ function! vimtex#toc#init_script() " {{{1
         \ }
 
   " Define regular expressions to match document parts
-  let s:re_sec = '\v^\s*\\%(part|chapter|%(sub)*section)\*?\s*\{'
+  let s:re_sec = '\v^\s*\\%(part|chapter|%(sub)*section)\*?\s*%(\[.{-}\])?\{'
   let s:re_sec_starred = '\v^\s*\\%(part|chapter|%(sub)*section)\*'
   let s:re_sec_level = '\v^\s*\\\zs%(part|chapter|%(sub)*section)'
   let s:re_sec_title = s:re_sec . '\zs.{-}\ze\}?$'
diff --git a/test/feature/table-of-contents/frontmatter.tex b/test/feature/table-of-contents/frontmatter.tex
index aed32c0..96b4167 100644
--- a/test/feature/table-of-contents/frontmatter.tex
+++ b/test/feature/table-of-contents/frontmatter.tex
@@ -3,6 +3,6 @@ Preface.
 
 \section{Acknowledgements}
 
-\chapter{Other frontmatter chapter}
+\chapter[Other]{Other frontmatter chapter}
 
 \tableofcontents