diff --git a/tox.ini b/tox.ini
index 1946992..8cb1c96 100644
--- a/tox.ini
+++ b/tox.ini
@@ -73,6 +73,7 @@ source =
 omit =
     .tox/*
     */charmhelpers/*
+    unit_tests/*
 
 [testenv:venv]
 basepython = python3