diff --git a/tox.ini b/tox.ini
index 72da1184..2b49776e 100644
--- a/tox.ini
+++ b/tox.ini
@@ -6,9 +6,6 @@ skipsdist = True
 [testenv]
 usedevelop = True
 install_command = pip install -U {opts} {packages}
-setenv = LANG=en_US.UTF-8
-         LANGUAGE=en_US:en
-         LC_ALL=C
 deps= -r{toxinidir}/requirements.txt
       -r{toxinidir}/test-requirements.txt
 commands=