diff --git a/lkmpg.tex b/lkmpg.tex
index 6b309b1..1f82a94 100644
--- a/lkmpg.tex
+++ b/lkmpg.tex
@@ -4,6 +4,7 @@
 \usepackage[T1]{fontenc}
 \usepackage{graphicx}
 \usepackage{fancyhdr}
+\usepackage{xparse}
 
 % tikz settings
 \usepackage{tikz}