diff --git a/tox.ini b/tox.ini
index 8bd4fc6..ca88e01 100644
--- a/tox.ini
+++ b/tox.ini
@@ -15,7 +15,7 @@ deps =
     pytest >= 2.9
 commands =
     coverage run --source=bin/ --omit=bin/autojump_argparse.py -m \
-        py.test -vv -rxs --tb native -s --strict {posargs:tests}
+        py.test -vv -rxs --tb native -s --strict-markers {posargs:tests}
     coverage report -m