diff --git a/setup.py b/setup.py
index 8ae0e99fb..0de3590b9 100644
--- a/setup.py
+++ b/setup.py
@@ -20,7 +20,7 @@ def get_setup_version(reponame):
     # (https://github.com/pypa/pip/issues/1197)
     'tests': [
         'pytest',
-        'pytest-cov',
+        'coverage',
         'flake8',
     ],
     'doc': [
diff --git a/tox.ini b/tox.ini
index 2f698123d..8169cbb28 100644
--- a/tox.ini
+++ b/tox.ini
@@ -16,7 +16,9 @@ python =
 description = run test suite under {basepython}
 deps = .[tests]
 commands =
-    pytest tests --cov=numbergen --cov=param --cov-append --cov-report xml
+    coverage run --source=numbergen,param -m pytest tests
+    coverage report
+    coverage xml
 
 [testenv:with_numpy]
 description = run test suite with numpy under {basepython}
diff --git a/tox27.ini b/tox27.ini
index 57e3dacdc..1c6079bb9 100644
--- a/tox27.ini
+++ b/tox27.ini
@@ -10,7 +10,9 @@ python =
 description = run test suite under {basepython}
 deps = .[tests]
 commands =
-    pytest tests --ignore tests/API1/testparamdepends_py3.py --cov=numbergen --cov=param --cov-append --cov-report xml
+    coverage run --source=numbergen,param -m pytest tests --ignore tests/API1/testparamdepends_py3.py
+    coverage report --omit param/_async.py
+    coverage xml --omit param/_async.py
 
 [testenv:with_numpy]
 description = run test suite with numpy under {basepython}