diff --git a/tox.ini b/tox.ini
index 57a949c2..6d61ee09 100644
--- a/tox.ini
+++ b/tox.ini
@@ -10,6 +10,10 @@ extras =
     tests
     unstable-plugins
 
+# setting LC_ALL to make Click work on pypy37
+setenv =
+    LC_ALL = en_US.utf-8
+
 commands = ./run.sh coverage-run --cov-append
 
 depends =