diff --git a/structure.tex b/structure.tex
index 8d5fbad..fd8b994 100644
--- a/structure.tex
+++ b/structure.tex
@@ -6,6 +6,7 @@
 \usepackage{geometry}
 \usepackage{listings}
 \usepackage{color}
+\usepackage[dvipsnames]{xcolor}
 \usepackage{graphicx}
 \usepackage[numbers,square,sectionbib,comma,nonamebreak,elide]{natbib}
 \usepackage{float}