diff --git a/setup.cfg b/setup.cfg
index 5b9388e2..7e495d3e 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,5 +1,6 @@
 [mypy]
 strict = True
+warn_unreachable = True
 implicit_reexport = True
 disallow_any_explicit = True