diff --git a/setup.cfg b/setup.cfg
index 882a777c35e9b48cea8d7a24a7916ca99db18ea6..a866f0919004da1552a8dd64c32c9c7e1dedbd84 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -12,3 +12,15 @@ warn_redundant_casts = True
 warn_return_any = True
 warn_unreachable = True
 warn_unused_configs = True
+
+[tox:tox]
+envlist = py36,py37
+
+[testenv]
+# Beancount includes type declarations but not the `py.typed` flag file mypy
+# is looking for to know that. Create it ourselves.
+commands_pre = python -c 'import beancount, pathlib; pathlib.Path(beancount.__file__).with_name("py.typed").touch()'
+
+commands =
+  ./setup.py test
+  ./setup.py typecheck