diff --git a/main/core.tex b/main/core.tex
index ff2b512..7e2fb13 100644
--- a/main/core.tex
+++ b/main/core.tex
@@ -34,6 +34,7 @@
 \usepackage{ifthen}
 \usepackage[hidelinks]{hyperref}
 \usepackage{enumitem}
+\usepackage{gensymb}
 
 
 % Language Switching. Currently only English and German are supported