diff --git a/travis_tests.py b/travis_tests.py
index e4922cc8..f3789d23 100644
--- a/travis_tests.py
+++ b/travis_tests.py
@@ -32,7 +32,7 @@
 #!/usr/bin/env python
 
 import matplotlib 
-#matplotlib.use('agg')
+matplotlib.use('agg')
 matplotlib.rcParams[u'figure.figsize'] = (4,3)
 matplotlib.rcParams[u'text.usetex'] = False