diff --git a/include/proto/stream_interface.h b/include/proto/stream_interface.h
index 83c389a..632300a 100644
--- a/include/proto/stream_interface.h
+++ b/include/proto/stream_interface.h
@@ -114,6 +114,8 @@
 static inline void stream_interface_prepare(struct stream_interface *si, const struct sock_ops *ops)
 {
 	si->conn.data = ops;
+	si->conn.data_st = 0;
+	si->conn.data_ctx = NULL;
 }