diff --git a/tox.ini b/tox.ini
index fbedcbe..3551f73 100644
--- a/tox.ini
+++ b/tox.ini
@@ -20,6 +20,7 @@ commands =
          python --version
          ./runtests.py
          ./runtests.py --use-tz=false
+allowlist_externals=./runtests.py
 deps =
      -r requirements-test.txt
      django22: Django==2.2.19