1 files changed, 1 insertions, 0 deletions

diff --git a/mypy.ini b/mypy.ini

index 3ae5d45787..32e6197409 100644
--- a/mypy.ini
+++ b/mypy.ini
@@ -8,6 +8,7 @@ show_traceback = True
 mypy_path = stubs
 warn_unreachable = True
 local_partial_types = True
+no_implicit_optional = True
 
 # To find all folders that pass mypy you run:
 #