diff --git a/include/haproxy/connection-t.h b/include/haproxy/connection-t.h
index 0c1fd92e0..2619fd66d 100644
--- a/include/haproxy/connection-t.h
+++ b/include/haproxy/connection-t.h
@@ -339,6 +339,11 @@ enum mux_ctl_type {
 	MUX_CTL_SUBS_RECV, /* Notify the mux it must wait for read events again  */
 };
 
+/* sctl command used by mux->sctl() */
+enum mux_sctl_type {
+	MUX_SCTL_SID, /* Return the mux stream ID as ouput, as a signed 64bits integer */
+};
+
 /* response for ctl MUX_STATUS */
 #define MUX_STATUS_READY (1 << 0)
 
@@ -440,6 +445,7 @@ struct mux_ops {
 	int (*show_sd)(struct buffer *, struct sedesc *, const char *pfx); /* append some data about the mux stream into chunk for "show sess"; returns non-zero if suspicious */
 	int (*subscribe)(struct stconn *sc, int event_type,  struct wait_event *es); /* Subscribe <es> to events, such as "being able to send" */
 	int (*unsubscribe)(struct stconn *sc, int event_type,  struct wait_event *es); /* Unsubscribe <es> from events */
+	int (*sctl)(struct stconn *sc, enum mux_sctl_type mux_sctl, void *arg); /* Provides information about the mux stream */
 	int (*avail_streams)(struct connection *conn); /* Returns the number of streams still available for a connection */
 	int (*avail_streams_bidi)(struct connection *conn); /* Returns the number of bidirectional streams still available for a connection */
 	int (*avail_streams_uni)(struct connection *conn); /* Returns the number of unidirectional streams still available for a connection */