diff --git a/tox.ini b/tox.ini
index 1d64129a..f6c0beb3 100644
--- a/tox.ini
+++ b/tox.ini
@@ -20,7 +20,7 @@ setenv =
   VIRTUAL_ENV={envdir}
   LANG=en_US.UTF-8
   LANGUAGE=en_US:en
-  LC_ALL=C
+  LC_ALL=en_US.UTF-8
   HOME={envdir}
 commands =
   stestr run --slowest --color {posargs}