diff --git a/tox.ini b/tox.ini
index a6249b1..a83cf0b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -20,12 +20,14 @@ commands = {posargs}
 
 [testenv:cover]
 setenv =
-    PYTHON=coverage run --source oslo_concurrency --parallel-mode
+    PYTHON=coverage run --source oslo_serialization --parallel-mode
 commands =
+  coverage erase
   stestr run {posargs}
   coverage combine
   coverage html -d cover
   coverage xml -o cover/coverage.xml
+  coverage report --show-missing
 
 [testenv:docs]
 allowlist_externals = rm