diff --git a/GPy/testing/pickle_tests.py b/GPy/testing/pickle_tests.py
index 05bde22a..b01f31a6 100644
--- a/GPy/testing/pickle_tests.py
+++ b/GPy/testing/pickle_tests.py
@@ -66,7 +66,7 @@ class Test(ListDictTestCase):
         with f:
             pickle.dump(piov, f)
 
-        with open(f):
+        with f:
             pio2 = GPy.load(f)
         #py3 fix
         #self.assertListDictEquals(dict(piov.items()), dict(pio2.iteritems()))