diff --git a/tox.ini b/tox.ini
index 93889322f..6bdc5d73f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -36,8 +36,6 @@ setenv =
 
     lsof: _PYTEST_TOX_POSARGS_LSOF=--lsof
 
-    pexpect: _PYTEST_TOX_PLATFORM=linux|darwin
-
     xdist: _PYTEST_TOX_POSARGS_XDIST=-n auto
 extras = testing
 deps =
@@ -49,7 +47,6 @@ deps =
     twisted: twisted
     xdist: pytest-xdist>=1.13
     {env:_PYTEST_TOX_EXTRA_DEP:}
-platform = {env:_PYTEST_TOX_PLATFORM:.*}
 
 [testenv:linting]
 skip_install = True