diff --git a/clock.c b/clock.c
index 9ffb43e..afee960 100644
--- a/clock.c
+++ b/clock.c
@@ -948,7 +948,7 @@ struct clock *clock_create(enum clock_type type, struct config *config,
 	c->timestamping = timestamping;
 	required_modes = clock_required_modes(c);
 	STAILQ_FOREACH(iface, &config->interfaces, list) {
-		rtnl_get_ts_label(iface);
+		rtnl_get_ts_device(iface->name, iface->ts_label);
 		ensure_ts_label(iface);
 		sk_get_ts_info(iface->ts_label, &iface->ts_info);
 		if (iface->ts_info.valid &&
diff --git a/nsm.c b/nsm.c
index cefea5d..fc10a60 100644
--- a/nsm.c
+++ b/nsm.c
@@ -267,7 +267,7 @@ static int nsm_open(struct nsm *nsm, struct config *cfg)
 	int count = 0;
 
 	STAILQ_FOREACH(iface, &cfg->interfaces, list) {
-		rtnl_get_ts_label(iface);
+		rtnl_get_ts_device(iface->name, iface->ts_label);
 		if (iface->ts_label[0] == '\0') {
 			strncpy(iface->ts_label, iface->name, MAX_IFNAME_SIZE);
 		}
diff --git a/rtnl.c b/rtnl.c
index cea936b..f9a572b 100644
--- a/rtnl.c
+++ b/rtnl.c
@@ -43,13 +43,13 @@ int rtnl_close(int fd)
 	return close(fd);
 }
 
-static void rtnl_get_ts_label_callback(void *ctx, int linkup, int ts_index)
+static void rtnl_get_ts_device_callback(void *ctx, int linkup, int ts_index)
 {
 	int *dst = ctx;
 	*dst = ts_index;
 }
 
-int rtnl_get_ts_label(struct interface *iface)
+int rtnl_get_ts_device(char *device, char *ts_device)
 {
 	int err, fd;
 	int ts_index = -1;
@@ -58,13 +58,13 @@ int rtnl_get_ts_label(struct interface *iface)
 	if (fd < 0)
 		return fd;
 
-	err = rtnl_link_query(fd, iface->name);
+	err = rtnl_link_query(fd, device);
 	if (err) {
 		goto no_info;
 	}
 
-	rtnl_link_status(fd, iface->name, rtnl_get_ts_label_callback, &ts_index);
-	if (ts_index > 0 && if_indextoname(ts_index, iface->ts_label))
+	rtnl_link_status(fd, device, rtnl_get_ts_device_callback, &ts_index);
+	if (ts_index > 0 && if_indextoname(ts_index, ts_device))
 		err = 0;
 	else
 		err = -1;
diff --git a/rtnl.h b/rtnl.h
index 2906d74..f877cd2 100644
--- a/rtnl.h
+++ b/rtnl.h
@@ -20,8 +20,6 @@
 #ifndef HAVE_RTNL_H
 #define HAVE_RTNL_H
 
-#include "config.h"
-
 typedef void (*rtnl_callback)(void *ctx, int linkup, int ts_index);
 
 /**
@@ -32,11 +30,14 @@ typedef void (*rtnl_callback)(void *ctx, int linkup, int ts_index);
 int rtnl_close(int fd);
 
 /**
- * Get interface ts_label information
- * @param iface  struct interface.
- * @return       Zero on success, or -1 on error.
+ * Get name of the slave interface which timestamps packets going through
+ * a master interface (e.g. bond0)
+ * @param device    Name of the master interface.
+ * @param ts_device Buffer for the name of the slave interface, which must be
+ *                  at least IF_NAMESIZE bytes long.
+ * @return          Zero on success, or -1 on error.
  */
-int rtnl_get_ts_label(struct interface *iface);
+int rtnl_get_ts_device(char *device, char *ts_device);
 
 /**
  * Request the link status from the kernel.