1 files changed, 16 insertions, 2 deletions

diff --git a/tox.ini b/tox.ini
index 1b72783..9db5c7f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -8,7 +8,7 @@ commands =
     {envpython} -m doctest README.rst
     {envpython} -m doctest jsonschema.py
 deps =
-    mock
+    {[testenv:notpy33]deps}
     {[testenv:py33]deps}
 
 [testenv:docs]
@@ -20,11 +20,25 @@ commands =
 
 [testenv:py26]
 deps =
-    {[testenv]deps}
+    {[testenv:notpy33]deps}
+    {[testenv:all]deps}
     unittest2
 
 [testenv:py33]
 deps =
+    {[testenv:all]deps}
+    {[testenv:notpy26]deps}
+
+[testenv:notpy33]
+deps =
+    mock
+
+[testenv:notpy26]
+deps =
+    rfc3987
+
+[testenv:all]
+deps =
     isodate
     nose
     sphinx