diff --git a/use_me.tex b/use_me.tex
index 1be55c7..192d75e 100644
--- a/use_me.tex
+++ b/use_me.tex
@@ -8,6 +8,8 @@
 
 \usepackage{listings}
 
+\usepackage{underscore}
+
 \lstdefinestyle{animateblocks}{
 	basicstyle=\color{black!20},
 	moredelim=**[is][\only<+>{\color{black}}]{@}{@},