diff --git a/include/ntapi/nt_socket.h b/include/ntapi/nt_socket.h
index b0448b7..aca18ba 100644
--- a/include/ntapi/nt_socket.h
+++ b/include/ntapi/nt_socket.h
@@ -399,6 +399,7 @@ typedef struct _nt_socket {
 			uint32_t	vfdpid;
 		};
 
+		void *	hkey;
 		void *	hpair;
 		void *	hasync;
 		void *	hobject;