diff --git a/tox.ini b/tox.ini
index 0aa986b4..b04efcbe 100644
--- a/tox.ini
+++ b/tox.ini
@@ -28,7 +28,7 @@ deps =
     pytest-cov
     pywin32 ; sys.platform == 'win32'
 commands =
-    {posargs:pytest --cov --cov-report=term-missing tests}
+    {posargs:pytest --cov --cov-report=term-missing --cov-branch tests}
 
 [flake8]
 max-line-length = 79