diff --git a/utils/autopart/files/autopart b/utils/autopart/files/autopart
index 6d946c699..c35b238ad 100644
--- a/utils/autopart/files/autopart
+++ b/utils/autopart/files/autopart
@@ -70,7 +70,7 @@ autopart_init() {
 	lvmpart=$(get_partition_by_name $diskdev $OWRT_VOLUMES)
 
 	[ "$lvmpart" ] || return
-	lvm_init /dev/$lvmpart "${OWRT_VOLUMES}${diskserial}"
+	lvm_init /dev/$lvmpart "${OWRT_VOLUMES}${diskserial:+-${diskserial:2}}"
 }
 
 autopart_init