diff --git a/mayan/apps/checkouts/tasks.py b/mayan/apps/checkouts/tasks.py
index 9b5ea5d9a8..046c9a8e40 100644
--- a/mayan/apps/checkouts/tasks.py
+++ b/mayan/apps/checkouts/tasks.py
@@ -4,7 +4,7 @@ import logging
 
 from django.apps import apps
 
-from lock_manager import Lock, LockError
+from lock_manager import LockError
 from mayan.celery import app
 
 from .literals import CHECKOUT_EXPIRATION_LOCK_EXPIRE
@@ -17,12 +17,15 @@ def task_check_expired_check_outs():
     DocumentCheckout = apps.get_model(
         app_label='checkouts', model_name='DocumentCheckout'
     )
+    Lock = apps.get_model(
+        app_label='lock_manager', model_name='Lock'
+    )
 
     logger.debug('executing...')
     lock_id = 'task_expired_check_outs'
     try:
         logger.debug('trying to acquire lock: %s', lock_id)
-        lock = Lock.acquire_lock(
+        lock = Lock.objects.acquire_lock(
             name=lock_id, timeout=CHECKOUT_EXPIRATION_LOCK_EXPIRE
         )
         logger.debug('acquired lock: %s', lock_id)
diff --git a/mayan/apps/document_indexing/tasks.py b/mayan/apps/document_indexing/tasks.py
index 507ba9bdd4..5b115d9d35 100644
--- a/mayan/apps/document_indexing/tasks.py
+++ b/mayan/apps/document_indexing/tasks.py
@@ -6,7 +6,7 @@ from django.apps import apps
 from django.db import OperationalError
 
 from mayan.celery import app
-from lock_manager import Lock, LockError
+from lock_manager import LockError
 
 from .literals import RETRY_DELAY
 
@@ -18,9 +18,12 @@ def task_delete_empty_index_nodes(self):
     IndexInstanceNode = apps.get_model(
         app_label='document_indexing', model_name='IndexInstanceNode'
     )
+    Lock = apps.get_model(
+        app_label='lock_manager', model_name='Lock'
+    )
 
     try:
-        rebuild_lock = Lock.acquire_lock(
+        rebuild_lock = Lock.objects.acquire_lock(
             'document_indexing_task_do_rebuild_all_indexes'
         )
     except LockError as exception:
@@ -43,8 +46,12 @@ def task_index_document(self, document_id):
         app_label='document_indexing', model_name='IndexInstanceNode'
     )
 
+    Lock = apps.get_model(
+        app_label='lock_manager', model_name='Lock'
+    )
+
     try:
-        rebuild_lock = Lock.acquire_lock(
+        rebuild_lock = Lock.objects.acquire_lock(
             'document_indexing_task_do_rebuild_all_indexes'
         )
     except LockError as exception:
@@ -52,7 +59,7 @@ def task_index_document(self, document_id):
         raise self.retry(exc=exception)
     else:
         try:
-            lock = Lock.acquire_lock(
+            lock = Lock.objects.acquire_lock(
                 'document_indexing_task_update_index_document_%d' % document_id
             )
         except LockError as exception:
@@ -89,12 +96,16 @@ def task_do_rebuild_all_indexes(self):
         app_label='document_indexing', model_name='IndexInstanceNode'
     )
 
+    Lock = apps.get_model(
+        app_label='lock_manager', model_name='Lock'
+    )
+
     if Lock.check_existing(name__startswith='document_indexing_task_update_index_document'):
         # A document index update is happening, wait
         raise self.retry()
 
     try:
-        lock = Lock.acquire_lock(
+        lock = Lock.objects.acquire_lock(
             'document_indexing_task_do_rebuild_all_indexes'
         )
     except LockError as exception:
diff --git a/mayan/apps/lock_manager/__init__.py b/mayan/apps/lock_manager/__init__.py
index b6a5ddb03c..c2d5d99bd3 100644
--- a/mayan/apps/lock_manager/__init__.py
+++ b/mayan/apps/lock_manager/__init__.py
@@ -1,7 +1,5 @@
 from __future__ import unicode_literals
 
 from .exceptions import LockError  # NOQA
-from .models import Lock as LockModel
 
-Lock = LockModel.objects
 default_app_config = 'lock_manager.apps.LockManagerApp'
diff --git a/mayan/apps/ocr/tasks.py b/mayan/apps/ocr/tasks.py
index 485c28b447..7406a1bed3 100644
--- a/mayan/apps/ocr/tasks.py
+++ b/mayan/apps/ocr/tasks.py
@@ -4,11 +4,12 @@ import logging
 import sys
 import traceback
 
+from django.apps import apps
 from django.conf import settings
 from django.db import OperationalError
 
 from documents.models import DocumentVersion
-from lock_manager import Lock, LockError
+from lock_manager import LockError
 from mayan.celery import app
 
 from .classes import TextExtractor
@@ -21,12 +22,16 @@ logger = logging.getLogger(__name__)
 
 @app.task(bind=True, default_retry_delay=DO_OCR_RETRY_DELAY, ignore_result=True)
 def task_do_ocr(self, document_version_pk):
+    Lock = apps.get_model(
+        app_label='lock_manager', model_name='Lock'
+    )
+
     lock_id = 'task_do_ocr_doc_version-%d' % document_version_pk
     try:
         logger.debug('trying to acquire lock: %s', lock_id)
         # Acquire lock to avoid doing OCR on the same document version more than
         # once concurrently
-        lock = Lock.acquire_lock(lock_id, LOCK_EXPIRE)
+        lock = Lock.objects.acquire_lock(lock_id, LOCK_EXPIRE)
         logger.debug('acquired lock: %s', lock_id)
         document_version = None
         try: