diff --git a/src/rspro_client_fsm.h b/src/rspro_client_fsm.h
index c11e260..7a998dc 100644
--- a/src/rspro_client_fsm.h
+++ b/src/rspro_client_fsm.h
@@ -10,6 +10,7 @@
 	SRVC_E_TCP_DOWN,
 	SRVC_E_KA_TIMEOUT,
 	SRVC_E_CLIENT_CONN_RES,
+	SRVC_E_RSPRO_TX		/* transmit a RSPRO PDU to the peer */
 };
 
 struct rspro_server_conn;