diff --git a/include/netinet/tcp.h b/include/netinet/tcp.h
index b7b997f5..30f20239 100644
--- a/include/netinet/tcp.h
+++ b/include/netinet/tcp.h
@@ -281,12 +281,17 @@ struct tcp_repair_window {
 	uint32_t rcv_wup;
 };
 
+#define TCP_RECEIVE_ZEROCOPY_FLAG_TLB_CLEAN_HINT 0x1
+
 struct tcp_zerocopy_receive {
 	uint64_t address;
 	uint32_t length;
 	uint32_t recv_skip_hint;
 	uint32_t inq;
 	int32_t err;
+	uint64_t copybuf_address;
+	int32_t copybuf_len;
+	uint32_t flags;
 };
 
 #endif