diff --git a/src/hnbgw_hnbap.c b/src/hnbgw_hnbap.c
index 495c71d..65e5cc9 100644
--- a/src/hnbgw_hnbap.c
+++ b/src/hnbgw_hnbap.c
@@ -16,7 +16,8 @@
 
 static int hnbgw_hnbap_tx(struct hnb_context *ctx, struct msgb *msg)
 {
-	/* FIXME */
+	msgb_ppid(msg) = IUH_PPI_HNBAP;
+	return osmo_wqueue_enqueue(&ctx->wqueue, msg);
 }
 
 static int hnbgw_tx_hnb_register_acc(struct hnb_context *ctx)