1 files changed, 1 insertions, 0 deletions

diff --git a/setup.cfg b/setup.cfg
index b998bc73..d4cf07e3 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -18,6 +18,7 @@ follow_imports = silent
 ignore_missing_imports = True
 strict_optional = False
 warn_no_return = False
+check_untyped_defs = True
 
 [tool:pytest]
 testpaths = test_isort.py