diff --git a/documentation/src/fltk-book.tex b/documentation/src/fltk-book.tex
index 629e51f95..4a00fcccc 100644
--- a/documentation/src/fltk-book.tex
+++ b/documentation/src/fltk-book.tex
@@ -28,7 +28,7 @@
 \usepackage[utf8]{inputenc}
 \usepackage{doxygen}
 \makeindex
-\setcounter{tocdepth}{3}
+\setcounter{tocdepth}{2}
 \renewcommand{\footrulewidth}{0.4pt}
 \begin{document}
 \begin{titlepage}