diff --git a/AsyncDisplayKit/ASMultiplexImageNode.h b/AsyncDisplayKit/ASMultiplexImageNode.h
index 73a74cbdeb..c81a402c5b 100644
--- a/AsyncDisplayKit/ASMultiplexImageNode.h
+++ b/AsyncDisplayKit/ASMultiplexImageNode.h
@@ -123,7 +123,7 @@ typedef NS_ENUM(NSUInteger, ASMultiplexImageNodeErrorCode) {
  
  * @see `+[NSURL URLWithAssetLocalIdentifier:targetSize:contentMode:options:]` below.
  */
-@property (nonatomic, strong) PHImageManager *imageManager;
+@property (nullable, nonatomic, strong) PHImageManager *imageManager;
 #endif
 @end