diff --git a/tox.ini b/tox.ini
index 5f06635d8..ec1d9b53f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -117,15 +117,16 @@ whitelist_externals = rm
 [testenv:functional]
 # This tox env is purely to make local test development easier
 # Note: This requires local running instances of Barbican and Keystone
+# TODO(dmend): remove --serial and uncomment coverage commands
 deps = -r{toxinidir}/test-requirements.txt
 setenv =
     OS_TEST_PATH={toxinidir}/functionaltests
 commands =
     /usr/bin/find . -type f -name "*.py[c|o]" -delete
-    stestr run --slowest {posargs}
-    coverage combine
-    coverage html -d cover
-    coverage xml -o cover/coverage.xml
+    stestr run --serial --slowest {posargs}
+    # coverage combine
+    # coverage html -d cover
+    # coverage xml -o cover/coverage.xml
 passenv = KMIP_PLUGIN_ENABLED
           VAULT_PLUGIN_ENABLED
           PKCS11_PLUGIN_ENABLED