diff --git a/tox.ini b/tox.ini
index 3e0e0e5..b1c678d 100644
--- a/tox.ini
+++ b/tox.ini
@@ -7,9 +7,6 @@ skipsdist = 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
          OS_STDOUT_NOCAPTURE=False
          OS_STDERR_NOCAPTURE=False