diff --git a/sys/kern/subr_disk.c b/sys/kern/subr_disk.c
index 11fe846dbf4b..af1ab847b1ac 100644
--- a/sys/kern/subr_disk.c
+++ b/sys/kern/subr_disk.c
@@ -41,6 +41,8 @@ disk_dev_synth(dev_t dev)
 	int u, s, p;
 	dev_t pdev;
 
+	if (dktype(dev))
+		return;
 	LIST_FOREACH(dp, &disklist, d_list) {
 		if (major(dev) != dp->d_devsw->d_maj)
 			continue;