diff --git a/setup.cfg b/setup.cfg
index 7023d4e585..00c6904fc0 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -16,6 +16,8 @@ classifier =
     Programming Language :: Python :: 2
     Programming Language :: Python :: 2.7
     Programming Language :: Python :: 2.6
+    Programming Language :: Python :: 3
+    Programming Language :: Python :: 3.3
 
 [files]
 packages =
diff --git a/tox.ini b/tox.ini
index 520a85cd42..bdb98bec69 100644
--- a/tox.ini
+++ b/tox.ini
@@ -7,6 +7,7 @@ skipdist = True
 usedevelop = True
 install_command = pip install -U {opts} {packages}
 setenv = VIRTUAL_ENV={envdir}
+         PYTHONHASHSEED=0
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 commands = python setup.py testr --testr-args='{posargs}'