diff --git a/liuthesis.cls b/liuthesis.cls
index 08938eace1882df25fc809e1dc1acff9ad828369..5b4afbdd94fa4e32a85ea62d470522c5afe32904 100644
--- a/liuthesis.cls
+++ b/liuthesis.cls
@@ -373,12 +373,6 @@
 \RequirePackage{calc}
 \RequirePackage{ragged2e}
 
-\newlength{\marginboxlength} 
-\setlength{\marginboxlength}{\paperwidth} 
-\addtolength{\marginboxlength}{-\textwidth}
-\addtolength{\marginboxlength}{-\spinemargin}
-\addtolength{\marginboxlength}{-2mm}
-
 \definecolor{nicered}{rgb}{.647,.129,.149} 
 \newsavebox{\feline@article} 
 \newcommand\feline@article@marker[1][4cm]{%