diff --git a/tox.ini b/tox.ini
index 7041c837..7c2e71c6 100644
--- a/tox.ini
+++ b/tox.ini
@@ -65,6 +65,7 @@ source =
 omit =
     .tox/*
     */charmhelpers/*
+    unit_tests/*
 
 [testenv:venv]
 basepython = python3