diff --git a/storage/nox.py b/storage/nox.py
index 18ccf81aaff2..428a380ea890 100644
--- a/storage/nox.py
+++ b/storage/nox.py
@@ -74,7 +74,7 @@ def system_tests(session, python_version):
     session.install('.')
 
     # Run py.test against the system tests.
-    session.run('py.test', '--quiet', 'tests/system.py')
+    session.run('py.test', '--quiet', 'tests/system.py', *session.posargs)
 
 
 @nox.session