diff --git a/tox.ini b/tox.ini
index def878c..d96d709 100644
--- a/tox.ini
+++ b/tox.ini
@@ -29,7 +29,7 @@ setenv =
   VIRTUAL_ENV={envdir}
   LANG=en_US.UTF-8
   LANGUAGE=en_US:en
-  LC_ALL=C
+  LC_ALL=en_US.UTF-8
   HOME={envdir}
   DISABLE_PIP_VERSION_CHECK=1
 commands =