diff --git a/tox.ini b/tox.ini
index 8102f5a41a..d819233b9a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -5,9 +5,6 @@ skipsdist = True
 
 [testenv]
 setenv = VIRTUAL_ENV={envdir}
-         LANG=en_US.UTF-8
-         LANGUAGE=en_US:en
-         LC_ALL=C
 usedevelop = True
 install_command = pip install --allow-all-external --allow-insecure netaddr -U {opts} {packages}
 deps = -r{toxinidir}/requirements.txt