diff --git a/sys/miscfs/specfs/spec_vnops.c b/sys/miscfs/specfs/spec_vnops.c
index 8b4ed335880a..e6295f9786de 100644
--- a/sys/miscfs/specfs/spec_vnops.c
+++ b/sys/miscfs/specfs/spec_vnops.c
@@ -789,8 +789,13 @@ spec_open(void *v)
 		 *
 		 * Treat zero opencnt with non-NULL mountpoint as open.
 		 * This may happen after forced detach of a mounted device.
+		 *
+		 * Also treat sd_closing, meaning there is a concurrent
+		 * close in progress, as still open.
 		 */
-		if (sd->sd_opencnt != 0 || sd->sd_mountpoint != NULL) {
+		if (sd->sd_opencnt != 0 ||
+		    sd->sd_mountpoint != NULL ||
+		    sd->sd_closing) {
 			error = EBUSY;
 			break;
 		}