diff --git a/todonotes.dtx b/todonotes.dtx
index b07771c..44eab35 100644
--- a/todonotes.dtx
+++ b/todonotes.dtx
@@ -1218,7 +1218,7 @@
 \RequirePackage{xcolor}
 \RequirePackage{tikz}
 \usetikzlibrary{positioning}
-\usetikzlibrary{shadows}
+
 \RequirePackage{calc}
 %    \end{macrocode}
 % Implement a function for setting up the todonotes package.