diff --git a/mayan/apps/document_indexing/literals.py b/mayan/apps/document_indexing/literals.py
new file mode 100644
index 0000000000..a227799d07
--- /dev/null
+++ b/mayan/apps/document_indexing/literals.py
@@ -0,0 +1 @@
+RETRY_DELAY = 20  # TODO: convert this into a config option
diff --git a/mayan/apps/document_indexing/tasks.py b/mayan/apps/document_indexing/tasks.py
index 4838757984..e2850a953e 100644
--- a/mayan/apps/document_indexing/tasks.py
+++ b/mayan/apps/document_indexing/tasks.py
@@ -6,19 +6,19 @@ from mayan.celery import app
 from documents.models import Document
 from lock_manager import Lock, LockError
 
+from .literals import RETRY_DELAY
 from .models import IndexInstanceNode
 
 logger = logging.getLogger(__name__)
-RETRY_DELAY = 20  # TODO: convert this into a config option
 
 
-@app.task(bind=True, ignore_result=True)
+@app.task(bind=True, default_retry_delay=RETRY_DELAY, ignore_result=True)
 def task_delete_empty_index_nodes(self):
     try:
         rebuild_lock = Lock.acquire_lock('document_indexing_task_do_rebuild_all_indexes')
     except LockError as exception:
         # A rebuild is happening, retry later
-        raise self.retry(exc=exception, countdown=RETRY_DELAY)
+        raise self.retry(exc=exception)
     else:
         try:
             IndexInstanceNode.objects.delete_empty_index_nodes()
@@ -26,19 +26,19 @@ def task_delete_empty_index_nodes(self):
             rebuild_lock.release()
 
 
-@app.task(bind=True, ignore_result=True)
+@app.task(bind=True, default_retry_delay=RETRY_DELAY, ignore_result=True)
 def task_index_document(self, document_id):
     try:
         rebuild_lock = Lock.acquire_lock('document_indexing_task_do_rebuild_all_indexes')
     except LockError as exception:
         # A rebuild is happening, retry later
-        raise self.retry(exc=exception, countdown=RETRY_DELAY)
+        raise self.retry(exc=exception)
     else:
         try:
             lock = Lock.acquire_lock('document_indexing_task_update_index_document_%d' % document_id)
         except LockError as exception:
             # This document is being reindexed by another task, retry later
-            raise self.retry(exc=exception, countdown=RETRY_DELAY)
+            raise self.retry(exc=exception)
         else:
             try:
                 document = Document.objects.get(pk=document_id)
@@ -53,17 +53,17 @@ def task_index_document(self, document_id):
             rebuild_lock.release()
 
 
-@app.task(bind=True, ignore_result=True)
+@app.task(bind=True, default_retry_delay=RETRY_DELAY, ignore_result=True)
 def task_do_rebuild_all_indexes(self):
     if Lock.filter(name__startswith='document_indexing_task_update_index_document'):
         # A document index update is happening, wait
-        raise self.retry(countdown=RETRY_DELAY)
+        raise self.retry()
 
     try:
         lock = Lock.acquire_lock('document_indexing_task_do_rebuild_all_indexes')
     except LockError as exception:
         # Another rebuild is happening, retry later
-        raise self.retry(exc=exception, countdown=RETRY_DELAY)
+        raise self.retry(exc=exception)
     else:
         try:
             IndexInstanceNode.objects.rebuild_all_indexes()