diff --git a/tox.ini b/tox.ini
index 5fb64a7..e9dd4c0 100644
--- a/tox.ini
+++ b/tox.ini
@@ -15,7 +15,7 @@ exclude = setup.py,.tox,build
 
 [testenv]
 deps = -rtox_deps.txt
-platform = posix: (linux|macos)
+platform = posix: (linux|darwin)
            windows: win32
 whitelist_externals =
   py.test