diff --git a/sys/cam/scsi/scsi_all.c b/sys/cam/scsi/scsi_all.c
index 722b44faed0..fe92500d98d 100644
--- a/sys/cam/scsi/scsi_all.c
+++ b/sys/cam/scsi/scsi_all.c
@@ -8788,6 +8788,7 @@ scsi_persistent_reserve_out(struct ccb_scsiio *csio, uint32_t retries,
 	scsi_cmd->opcode = PERSISTENT_RES_OUT;
 	scsi_cmd->action = service_action;
 	scsi_cmd->scope_type = scope | res_type;
+	scsi_ulto4b(dxfer_len, scsi_cmd->length);
 
 	cam_fill_csio(csio,
 		      retries,