diff --git a/tox.ini b/tox.ini
index 8b34df1e9cf7..f4f19cb5f9b8 100644
--- a/tox.ini
+++ b/tox.ini
@@ -8,9 +8,6 @@ sitepackages = True
 usedevelop = True
 install_command = pip install -U {opts} {packages}
 setenv = VIRTUAL_ENV={envdir}
-         LANG=en_US.UTF-8
-         LANGUAGE=en_US:en
-         LC_ALL=C
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 commands =