diff --git a/tox.ini b/tox.ini
index d1c8519..6c62e63 100644
--- a/tox.ini
+++ b/tox.ini
@@ -8,9 +8,6 @@ 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 = python setup.py testr --slowest --testr-args='{posargs}'