diff --git a/mediapipe/tasks/ios/vision/image_classifier/sources/MPPImageClassifierOptions.h b/mediapipe/tasks/ios/vision/image_classifier/sources/MPPImageClassifierOptions.h
index 92f8ebc5d..b943dd30d 100644
--- a/mediapipe/tasks/ios/vision/image_classifier/sources/MPPImageClassifierOptions.h
+++ b/mediapipe/tasks/ios/vision/image_classifier/sources/MPPImageClassifierOptions.h
@@ -63,7 +63,7 @@ NS_SWIFT_NAME(ImageClassifierOptions)
  * to receive the results of asynchronous classification on images (i.e, when `runningMode =
  * MPPRunningModeLiveStream`).
  */
-@property(nonatomic, weak) id<MPPImageClassifierDelegate> imageClassifierDelegate;
+@property(nonatomic, weak, nullable) id<MPPImageClassifierDelegate> imageClassifierDelegate;
 
 /**
  * The locale to use for display names specified through the TFLite Model Metadata, if any. Defaults
diff --git a/mediapipe/tasks/ios/vision/object_detector/sources/MPPObjectDetectorOptions.h b/mediapipe/tasks/ios/vision/object_detector/sources/MPPObjectDetectorOptions.h
index 8075ee5cc..6d5eeda4e 100644
--- a/mediapipe/tasks/ios/vision/object_detector/sources/MPPObjectDetectorOptions.h
+++ b/mediapipe/tasks/ios/vision/object_detector/sources/MPPObjectDetectorOptions.h
@@ -60,7 +60,7 @@ NS_SWIFT_NAME(ObjectDetectorOptions)
  * to receive the results of performing asynchronous object detection on images (i.e, when
  * `runningMode` = `MPPRunningModeLiveStream`).
  */
-@property(nonatomic, weak) id<MPPObjectDetectorDelegate> objectDetectorDelegate;
+@property(nonatomic, weak, nullable) id<MPPObjectDetectorDelegate> objectDetectorDelegate;
 
 /**
  * The locale to use for display names specified through the TFLite Model Metadata, if any. Defaults