diff --git a/Source/IGListKit/IGListBindingSectionController.h b/Source/IGListKit/IGListBindingSectionController.h
index 5647e4b73..62bc30d65 100644
--- a/Source/IGListKit/IGListBindingSectionController.h
+++ b/Source/IGListKit/IGListBindingSectionController.h
@@ -48,6 +48,7 @@ NS_ASSUME_NONNULL_BEGIN
  Only when `-diffIdentifier`s match is object equality compared, so you can assume the class is the same, and the
  instance has already been checked.
  */
+NS_SWIFT_UI_ACTOR
 NS_SWIFT_NAME(ListBindingSectionController)
 @interface IGListBindingSectionController<__covariant ObjectType : id<IGListDiffable>> : IGListSectionController
 
diff --git a/Source/IGListKit/IGListBindingSectionControllerDataSource.h b/Source/IGListKit/IGListBindingSectionControllerDataSource.h
index f195449f7..0901dea50 100644
--- a/Source/IGListKit/IGListBindingSectionControllerDataSource.h
+++ b/Source/IGListKit/IGListBindingSectionControllerDataSource.h
@@ -17,6 +17,7 @@ NS_ASSUME_NONNULL_BEGIN
 /**
  A protocol that returns data to power cells in an `IGListBindingSectionController`.
  */
+NS_SWIFT_UI_ACTOR
 NS_SWIFT_NAME(ListBindingSectionControllerDataSource)
 @protocol IGListBindingSectionControllerDataSource <NSObject>
 
diff --git a/Source/IGListKit/IGListSupplementaryViewSource.h b/Source/IGListKit/IGListSupplementaryViewSource.h
index 762c99059..c3c6a6706 100644
--- a/Source/IGListKit/IGListSupplementaryViewSource.h
+++ b/Source/IGListKit/IGListSupplementaryViewSource.h
@@ -14,6 +14,7 @@ NS_ASSUME_NONNULL_BEGIN
  `IGListAdapter` which then configures and maintains a `UICollectionView`. The supplementary API reflects that in
  `UICollectionView`, `UICollectionViewLayout`, and `UICollectionViewDataSource`.
  */
+NS_SWIFT_UI_ACTOR
 NS_SWIFT_NAME(ListSupplementaryViewSource)
 @protocol IGListSupplementaryViewSource <NSObject>