Overlapping numbers and titles in toc

Question

How can i change formatting of the table of contents to avoid section numbering and section title to overlap?

Document:

\documentclass[10pt,oneside,notitlepage]{book}

% Use Heuristica Font
\usepackage{heuristica}
\usepackage[heuristica,vvarbb,bigdelims]{newtxmath}
\renewcommand*\oldstylenums[1]{\textosf{#1}}


\begin{document}

\tableofcontents

\part{Part one}

\chapter{Chapter Oh}
\chapter{Chapter Oh}
\chapter{Chapter Oh}
\chapter{Chapter Oh}
\chapter{Chapter Oh}
\chapter{Chapter Oh}
\chapter{Chapter Oh}
\chapter{Chapter Oh}
\chapter{Chapter Oh}
\chapter{Chapter Oh}
\chapter{Chapter Oh}
\chapter{Chapter Oh}
\chapter{Chapter Oh}
\chapter{Chapter Oh}
\chapter{Chapter Oh}
\chapter{Chapter Oh}
\chapter{Chapter Oh}
\chapter{Chapter Oh}
\chapter{Chapter Oh}
\chapter{Chapter Oh}


\section{Chapter Hi}
\section{Chapter Hi}
\section{Chapter Hi}
\section{Chapter Hi}
\section{Chapter Hi}
\section{Chapter Hi}
\section{Chapter Hi}
\section{Chapter Hi}
\section{Chapter Hi}
\section{Chapter Hi}

\end{document}

Example output:

Please provide the minimal code that generates this wrong output. I assume that a wrong \thesection etc. command is applied or a misused of tocloft features — , Feb 29 '16 at 13:46
potentiial duplicate: Roman numerals become “too wide” in table of contents. (arabic numerals are no different from roman numerals in this respect.) — barbara beeton, Feb 29 '16 at 17:12
@ChristianHupfer I have added code and a new example screenshot. It looks like the heuristica font/package is causing the issue. — Nichlas H., Mar 01 '16 at 12:12

score 21 · Accepted Answer · answered Mar 01 '16 at 12:15

The space needed by the section number(s) is too small. Using tocloft this spacing can be controlled by the length register \cftsecnumwidth, adding some value with \addtolength{\cftsecnumwidth}{10pt} will improve the spacing.

The value of 10pt can be changed of course.

\documentclass[10pt,oneside,notitlepage]{book}

% Use Heuristica Font
\usepackage{heuristica}
\usepackage[heuristica,vvarbb,bigdelims]{newtxmath}
\renewcommand*\oldstylenums[1]{\textosf{#1}}
\usepackage{tocloft}

\addtolength{\cftsecnumwidth}{10pt}

\begin{document}

\tableofcontents

\part{Part one}

\chapter{Chapter Oh}
\chapter{Chapter Oh}
\chapter{Chapter Oh}
\chapter{Chapter Oh}
\chapter{Chapter Oh}
\chapter{Chapter Oh}
\chapter{Chapter Oh}
\chapter{Chapter Oh}
\chapter{Chapter Oh}
\chapter{Chapter Oh}
\chapter{Chapter Oh}
\chapter{Chapter Oh}
\chapter{Chapter Oh}
\chapter{Chapter Oh}
\chapter{Chapter Oh}
\chapter{Chapter Oh}
\chapter{Chapter Oh}
\chapter{Chapter Oh}
\chapter{Chapter Oh}
\chapter{Chapter Oh}


\section{Chapter Hi}
\section{Chapter Hi}
\section{Chapter Hi}
\section{Chapter Hi}
\section{Chapter Hi}
\section{Chapter Hi}
\section{Chapter Hi}
\section{Chapter Hi}
\section{Chapter Hi}
\section{Chapter Hi}

\end{document}

Thank you! That will work well into the third and fourth digit chapter numbers (i hope to end the document well before that!). Also thanks for hinting tocloft, looks like it has some interresting options. — Nichlas H., Mar 01 '16 at 12:19
@NichlasH.: You can change the value of 10pt to 'anything' -- as you wish. — , Mar 01 '16 at 12:21
Yes, I'll test it out and find what works for my document. I'm sorry that I don't have anough points (yet) to upvote your answer. — Nichlas H., Mar 01 '16 at 12:23
@NichlasH.: That's alright. You can accept it later on anyway ;-) — , Mar 01 '16 at 12:24
Doesn't work for me. Above like 10-20pt it stops changing the width — Caleb Stanford, Jul 28 '22 at 15:47

Overlapping numbers and titles in toc

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