diff --git a/tox.ini b/tox.ini
index 8efdce42..6f103aea 100644
--- a/tox.ini
+++ b/tox.ini
@@ -23,7 +23,7 @@ deps=
     coveralls
 commands=
     coverage erase
-    coverage run --rcfile=./.coveragerc -m unittest2 discover -s tests/unit/ -p test_*_py3.py
+    coverage run --rcfile=./.coveragerc -m unittest2 discover -s tests/unit/ -p test_*_py35.py
     coverage report --rcfile=./.coveragerc
     coveralls