diff --git a/wally/report.py b/wally/report.py
index 8fc8400..424e1fa 100644
--- a/wally/report.py
+++ b/wally/report.py
@@ -10,6 +10,7 @@
     import numpy
     import scipy
     import matplotlib
+    matplotlib.use('svg')
     import matplotlib.pyplot as plt
 except ImportError:
     plt = None