diff --git a/Documentation/latex/header.tex b/Documentation/latex/header.tex
index d34e13a837..24d2585ba9 100644
--- a/Documentation/latex/header.tex
+++ b/Documentation/latex/header.tex
@@ -17,6 +17,8 @@
 \usepackage{doxygen}
 \usepackage{listings}
 \usepackage{ifthen}
+\usepackage{alltt}
+\usepackage{upquote}
 \lstset{language=C++,inputencoding=utf8,basicstyle=\footnotesize,breaklines=true,breakatwhitespace=true,tabsize=8,numbers=left }
 \makeindex
 \setcounter{tocdepth}{3}