diff --git a/AsyncDisplayKit/ASMultiplexImageNode.h b/AsyncDisplayKit/ASMultiplexImageNode.h
index b6c6e97b6f..25e463b2af 100644
--- a/AsyncDisplayKit/ASMultiplexImageNode.h
+++ b/AsyncDisplayKit/ASMultiplexImageNode.h
@@ -16,7 +16,7 @@ NS_ASSUME_NONNULL_BEGIN
 @protocol ASMultiplexImageNodeDelegate;
 @protocol ASMultiplexImageNodeDataSource;
 
-typedef id<NSCopying> ASImageIdentifier;
+typedef id<NSCopying, NSObject> ASImageIdentifier;
 
 extern NSString *const ASMultiplexImageNodeErrorDomain;