Index: head/sys/geom/concat/g_concat.c
===================================================================
--- head/sys/geom/concat/g_concat.c
+++ head/sys/geom/concat/g_concat.c
@@ -897,6 +897,9 @@
 	struct g_concat_softc *sc;
 	struct g_geom *gp;
 
+	if (strncmp(name, _PATH_DEV, strlen(_PATH_DEV)) == 0)
+		name += strlen(_PATH_DEV);
+
 	LIST_FOREACH(gp, &mp->geom, geom) {
 		sc = gp->softc;
 		if (sc == NULL)