diff --git a/AsyncDisplayKit/ASVideoNode.h b/AsyncDisplayKit/ASVideoNode.h
index 6a500806ee..e906d54ac5 100644
--- a/AsyncDisplayKit/ASVideoNode.h
+++ b/AsyncDisplayKit/ASVideoNode.h
@@ -71,7 +71,7 @@ NS_ASSUME_NONNULL_BEGIN
 @property (nonatomic, assign) int32_t periodicTimeObserverTimescale;
 
 //! Defaults to AVLayerVideoGravityResizeAspect
-@property (nonatomic) NSString *gravity;
+@property (nonatomic, copy) NSString *gravity;
 
 @property (nullable, nonatomic, weak, readwrite) id<ASVideoNodeDelegate, ASNetworkImageNodeDelegate> delegate;
 
diff --git a/AsyncDisplayKit/ASVideoPlayerNode.h b/AsyncDisplayKit/ASVideoPlayerNode.h
index 98cb79e5a9..76f83c50f7 100644
--- a/AsyncDisplayKit/ASVideoPlayerNode.h
+++ b/AsyncDisplayKit/ASVideoPlayerNode.h
@@ -56,7 +56,7 @@ NS_ASSUME_NONNULL_BEGIN
 //! Defaults to 100
 @property (nonatomic, assign) int32_t periodicTimeObserverTimescale;
 //! Defaults to AVLayerVideoGravityResizeAspect
-@property (nonatomic) NSString *gravity;
+@property (nonatomic, copy) NSString *gravity;
 
 - (instancetype)initWithUrl:(NSURL*)url;
 - (instancetype)initWithAsset:(AVAsset*)asset;