diff --git a/mypy.ini b/mypy.ini
index bb2e331c53..b388924cc4 100644
--- a/mypy.ini
+++ b/mypy.ini
@@ -126,6 +126,9 @@ disallow_untyped_defs = True
 [mypy-tests.federation.transport.test_client]
 disallow_untyped_defs = True
 
+[mypy-tests.util.*]
+disallow_untyped_defs = True
+
 [mypy-tests.utils]
 disallow_untyped_defs = True