diff --git a/setup.cfg b/setup.cfg
index 7ea8404d9900ece604ea87101892a9e13002feeb..5b5b19de1b4b4adc386d66a58d556bf420f7ae64 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -4,6 +4,7 @@ typecheck=pytest --addopts="--mypy conservancy_beancount"
 
 [mypy]
 disallow_any_unimported = True
+disallow_untyped_calls = True
 disallow_untyped_defs = True
 show_error_codes = True
 strict_equality = True