diff --git a/.mypy.ini b/.mypy.ini
index 4a9cd17f4..c13cdf5b4 100644
--- a/.mypy.ini
+++ b/.mypy.ini
@@ -44,6 +44,8 @@ strict_optional = True
 strict_optional = True
 [mypy-aqt.preferences]
 strict_optional = True
+[mypy-aqt.customstudy]
+strict_optional = True
 [mypy-anki.scheduler.base]
 strict_optional = True
 [mypy-anki._backend.rsbridge]