diff --git a/port.c b/port.c
index facebd2..b8ae77e 100644
--- a/port.c
+++ b/port.c
@@ -55,7 +55,6 @@ enum syfu_event {
 	FUP_MATCH,
 };
 
-static int port_capable(struct port *p);
 static int port_is_ieee8021as(struct port *p);
 static void port_nrate_initialize(struct port *p);
 
@@ -602,7 +601,7 @@ static int peer_prepare_and_send(struct port *p, struct ptp_message *msg,
 	return 0;
 }
 
-static int port_capable(struct port *p)
+int port_capable(struct port *p)
 {
 	if (!port_is_ieee8021as(p)) {
 		/* Normal 1588 ports are always capable. */
diff --git a/port_private.h b/port_private.h
index 593eb76..b0b2a5d 100644
--- a/port_private.h
+++ b/port_private.h
@@ -157,6 +157,7 @@ void delay_req_prune(struct port *p);
 void fc_clear(struct foreign_clock *fc);
 void flush_delay_req(struct port *p);
 void flush_last_sync(struct port *p);
+int port_capable(struct port *p);
 int port_clr_tmo(int fd);
 int port_delay_request(struct port *p);
 void port_disable(struct port *p);