diff --git a/test/run_tests.py b/test/run_tests.py
index fc6d0293..76361e52 100644
--- a/test/run_tests.py
+++ b/test/run_tests.py
@@ -1,11 +1,11 @@
 # run all matplotlib based tests
 import glob
 import matplotlib
-matplotlib.use('Agg')
 matplotlib.rcParams.update(matplotlib.rcParamsDefault)
+matplotlib.use('agg')
 # Find all test files.
 test_files = glob.glob('test_*.py')
-test_files.remove('test_spectral.py') # skip spectral transform test
+#test_files.remove('test_spectral.py') # skip spectral transform test
 for f in test_files:
     print('running %s...' % f)
     exec(open(f).read())