1 files changed, 1 insertions, 1 deletions
diff --git a/tox.ini b/tox.ini
index f927e652..321b7062 100644
--- a/tox.ini
+++ b/tox.ini
@@ -9,7 +9,7 @@ deps = -U
 usedevelop = True
 passenv= NOSE_VERBOSE
 commands =
-  python ryu/tests/run_tests.py '{posargs}'
+  coverage run --source=ryu ryu/tests/run_tests.py '{posargs}'
 
 [testenv:pep8]
 commands =