diff --git a/include/osmocom/core/osmo_io.h b/include/osmocom/core/osmo_io.h
index 3715f93..8f3c060 100644
--- a/include/osmocom/core/osmo_io.h
+++ b/include/osmocom/core/osmo_io.h
@@ -86,6 +86,7 @@
 			  const struct osmo_sockaddr *dest);
 
 void osmo_iofd_set_alloc_info(struct osmo_io_fd *iofd, unsigned int size, unsigned int headroom);
+void osmo_iofd_set_txqueue_max_length(struct osmo_io_fd *iofd, unsigned int size);
 void *osmo_iofd_get_data(const struct osmo_io_fd *iofd);
 void osmo_iofd_set_data(struct osmo_io_fd *iofd, void *data);