diff --git a/port.h b/port.h
index e347e36..80c543e 100644
--- a/port.h
+++ b/port.h
@@ -33,6 +33,9 @@ struct clock;
 /** Opaque type. */
 struct port;
 
+/** The port identity that matches any port. */
+extern const struct PortIdentity wildcard_pid;
+
 /**
  * Returns the dataset from a port's best foreign clock record, if any
  * has yet been discovered. This function does not bring the returned
diff --git a/port_signaling.c b/port_signaling.c
index c4d5469..cbd0cf4 100644
--- a/port_signaling.c
+++ b/port_signaling.c
@@ -23,7 +23,7 @@
 #include "unicast_client.h"
 #include "unicast_service.h"
 
-static struct PortIdentity wildcard = {
+const struct PortIdentity wildcard_pid = {
 	.clockIdentity = {
 		{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}
 	},
@@ -126,7 +126,7 @@ int process_signaling(struct port *p, struct ptp_message *m)
 
 	/* Ignore signaling messages not addressed to this port. */
 	if (!pid_eq(&m->signaling.targetPortIdentity, &p->portIdentity) &&
-	    !pid_eq(&m->signaling.targetPortIdentity, &wildcard)) {
+	    !pid_eq(&m->signaling.targetPortIdentity, &wildcard_pid)) {
 		return 0;
 	}