diff --git a/python_tools/void_python_tools/backend/classes.py b/python_tools/void_python_tools/backend/classes.py
index db017ab..a4602a6 100644
--- a/python_tools/void_python_tools/backend/classes.py
+++ b/python_tools/void_python_tools/backend/classes.py
@@ -21,6 +21,8 @@
 
 import os
 from numpy import abs
+import matplotlib as mpl
+mpl.use('Agg')
 
 LIGHT_SPEED = 299792.458