diff --git a/mathbot/rendering.py b/mathbot/rendering.py
index d2c594e..eab229f 100644
--- a/mathbot/rendering.py
+++ b/mathbot/rendering.py
@@ -17,6 +17,8 @@
 #                                                                      #
 
 from io import BytesIO
+import matplotlib
+matplotlib.use("Agg")
 import matplotlib.pyplot as plt