diff --git a/tmpl/tex/en_technical/header.tex.tmpl b/tmpl/tex/en_technical/header.tex.tmpl
index bc521af4..dc0b7cb1 100644
--- a/tmpl/tex/en_technical/header.tex.tmpl
+++ b/tmpl/tex/en_technical/header.tex.tmpl
@@ -33,6 +33,7 @@
 \setcounter{secnumdepth}{3}
 \setcounter{tocdepth}{3}
 %\usepackage{amsmath}
+\usepackage{longtable}
 \usepackage{lscape}
 \usepackage{amsfonts}
 \usepackage{graphics}