diff -up jellyfish-0.5.2/jellyfish/test.py.orig jellyfish-0.5.2/jellyfish/test.py
--- jellyfish-0.5.2/jellyfish/test.py.orig	2016-02-04 10:22:53.493059734 +0100
+++ jellyfish-0.5.2/jellyfish/test.py	2016-02-04 10:23:00.156068232 +0100
@@ -15,7 +15,7 @@ def assertAlmostEqual(a, b, places=3):
 
 
 if platform.python_implementation() == 'CPython':
-    implementations = ['python', 'c']
+    implementations = ['python']
 else:
     implementations = ['python']