diff --git a/Parser/Sources/ObjC/RSHTMLMetadata.h b/Parser/Sources/ObjC/RSHTMLMetadata.h
index 63df7a1db..0010740a1 100755
--- a/Parser/Sources/ObjC/RSHTMLMetadata.h
+++ b/Parser/Sources/ObjC/RSHTMLMetadata.h
@@ -19,6 +19,7 @@
 
 NS_ASSUME_NONNULL_BEGIN
 
+__attribute__((swift_attr("@Sendable")))
 @interface RSHTMLMetadata : NSObject
 
 - (instancetype)initWithURLString:(NSString *)urlString tags:(NSArray <RSHTMLTag *> *)tags;