diff --git a/test/test_visualization.py b/test/test_visualization.py
index 7e1e763..072327a 100644
--- a/test/test_visualization.py
+++ b/test/test_visualization.py
@@ -3,7 +3,6 @@
 
 import numpy as np
 import mechkit
-import sys
 
 
 class Test_StiffnessAnalyser: