diff --git a/travis_tests.py b/travis_tests.py
index 36dc1568..f3789d23 100644
--- a/travis_tests.py
+++ b/travis_tests.py
@@ -32,10 +32,10 @@
 #!/usr/bin/env python
 
 import matplotlib 
-matplotlib.use('png')
+matplotlib.use('agg')
 matplotlib.rcParams[u'figure.figsize'] = (4,3)
 matplotlib.rcParams[u'text.usetex'] = False
 
 import nose 
-nose.main('GPy', defaultTest='GPy/testing')  
+nose.main('GPy', defaultTest='GPy/testing/plotting_tests.py')