diff --git a/circle.yml b/circle.yml
index 2d84374..931da97 100644
--- a/circle.yml
+++ b/circle.yml
@@ -11,4 +11,4 @@ dependencies:
 
 test:
   override:
-    - tox -e circleci_27 circleci_34 circleci_35 circleci_pypy
+    - tox -e circleci_27,circleci_34,circleci_35,circleci_pypy
diff --git a/tox.ini b/tox.ini
index 00e2804..767b25a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -12,13 +12,13 @@ commands = pip install .
         py.test -v
 
 [testenv:circleci_27]
-basepython = python-2.7.10
+basepython = python2.7.10
 
 [testenv:circleci_34]
-basepython = python-3.4.3
+basepython = python3.4.3
 
 [testenv:circleci_35]
-basepython = python-3.5
+basepython = python3.5
 
 [testenv:circleci_pypy]
 basepython = pypy-2.5.0