diff --git a/mypy.ini b/mypy.ini
index 3da7cfa..7762413 100644
--- a/mypy.ini
+++ b/mypy.ini
@@ -9,6 +9,7 @@ disallow_any_generics = True
 disallow_untyped_calls = True
 warn_redundant_casts = True
 warn_unused_configs = True
+warn_unreachable = True
 strict_equality = True
 
 [mypy-libp2p.kademlia.*]