diff --git a/apps/papra-server/src/modules/tasks/tasks.config.ts b/apps/papra-server/src/modules/tasks/tasks.config.ts
index 03df7f0..54727a8 100644
--- a/apps/papra-server/src/modules/tasks/tasks.config.ts
+++ b/apps/papra-server/src/modules/tasks/tasks.config.ts
@@ -43,9 +43,9 @@ export const tasksConfig = {
   },
   worker: {
     id: {
-      doc: 'The id of the task worker, used to identify the worker in the Cadence cluster in case of multiple workers',
+      doc: 'The id of the task worker, used to identify the worker in the Cadence cluster in case of multiple workers, should be unique per instance',
       schema: z.string().optional(),
-      env: ['TASKS_WORKER_ID', 'DYNO', 'RENDER_SERVICE_ID'],
+      env: ['TASKS_WORKER_ID', 'DYNO', 'RENDER_SERVICE_ID', 'FLY_MACHINE_ID'],
     },
   },
   hardDeleteExpiredDocuments: {