diff --git a/ess/ibsimu2tw.py b/ess/ibsimu2tw.py
index 9e6c108dfc9c63292abcca706ddecba67de94ee3..d3fa2c2624ab6dee9cffc741e77e622ee4ac6a02 100644
--- a/ess/ibsimu2tw.py
+++ b/ess/ibsimu2tw.py
@@ -38,8 +38,6 @@ file_name_out_H3 = 'ISRC.H3_ibsimu.2d_10M.83mA.dst'  # Comment out if H3 file is
 import numpy as np
 import sys
 
-import matplotlib.pyplot as plt
-
 #-- Function for saving
 
 def save_dst(file_name, x6, Ibeam, mc2=938.272, freq=352.21):