diff --git a/clock.c b/clock.c
index 9e9feba..1569108 100644
--- a/clock.c
+++ b/clock.c
@@ -73,6 +73,7 @@ struct clock_subscriber {
 };
 
 struct clock {
+	struct config *config;
 	clockid_t clkid;
 	struct servo *servo;
 	enum servo_type servo_type;
@@ -792,9 +793,10 @@ static void clock_remove_port(struct clock *c, struct port *p)
 	port_close(p);
 }
 
-struct clock *clock_create(int phc_index, struct interfaces_head *ifaces,
-			   enum timestamp_type timestamping, struct default_ds *dds,
-			   enum servo_type servo)
+struct clock *clock_create(struct config *config, int phc_index,
+			   struct interfaces_head *ifaces,
+			   enum timestamp_type timestamping,
+			   struct default_ds *dds, enum servo_type servo)
 {
 	int fadj = 0, max_adj = 0, sw_ts = timestamping == TS_SOFTWARE ? 1 : 0;
 	struct clock *c = &the_clock;
@@ -814,6 +816,7 @@ struct clock *clock_create(int phc_index, struct interfaces_head *ifaces,
 	udsif->transport = TRANS_UDS;
 	udsif->delay_filter_length = 1;
 
+	c->config = config;
 	c->free_running = dds->free_running;
 	c->freq_est_interval = dds->freq_est_interval;
 	c->grand_master_capable = dds->grand_master_capable;
diff --git a/clock.h b/clock.h
index a8286dd..1e6cd98 100644
--- a/clock.h
+++ b/clock.h
@@ -61,6 +61,7 @@ UInteger8 clock_class(struct clock *c);
  * Create a clock instance. There can only be one clock in any system,
  * so subsequent calls will destroy the previous clock instance.
  *
+ * @param config       Pointer to the configuration database.
  * @param phc_index    PTP hardware clock device to use.
  *                     Pass -1 to select CLOCK_REALTIME.
  * @param ifaces       A queue of network interfaces.
@@ -69,9 +70,10 @@ UInteger8 clock_class(struct clock *c);
  * @param servo        The servo that this clock will use.
  * @return             A pointer to the single global clock instance.
  */
-struct clock *clock_create(int phc_index, struct interfaces_head *ifaces,
-			   enum timestamp_type timestamping, struct default_ds *dds,
-			   enum servo_type servo);
+struct clock *clock_create(struct config *config, int phc_index,
+			   struct interfaces_head *ifaces,
+			   enum timestamp_type timestamping,
+			   struct default_ds *dds, enum servo_type servo);
 
 /**
  * Obtains a clock's default data set.
diff --git a/ptp4l.c b/ptp4l.c
index 61c5854..56cb8bd 100644
--- a/ptp4l.c
+++ b/ptp4l.c
@@ -377,7 +377,8 @@ int main(int argc, char *argv[])
 		return -1;
 	}
 
-	clock = clock_create(phc_index, &cfg_settings.interfaces,
+	clock = clock_create(&cfg_settings,
+			     phc_index, &cfg_settings.interfaces,
 			     *timestamping, &cfg_settings.dds,
 			     cfg_settings.clock_servo);
 	if (!clock) {