diff --git a/pybloom/tests.py b/pybloom/test_pybloom.py
similarity index 100%
rename from pybloom/tests.py
rename to pybloom/test_pybloom.py
diff --git a/tox.ini b/tox.ini
index 6d9848f..c078089 100644
--- a/tox.ini
+++ b/tox.ini
@@ -2,4 +2,4 @@
 envlist = py26,py27,py34
 [testenv]
 deps=pytest
-commands=py.test pybloom/tests.py
+commands=py.test pybloom/test_pybloom.py