diff --git a/rq/job.py b/rq/job.py
index 856890f..90c3a0e 100644
--- a/rq/job.py
+++ b/rq/job.py
@@ -49,7 +49,7 @@ class Job(object):
         keyword arguments.
         """
         connection = kwargs.pop('connection', None)
-        job = Job(connection=connection)
+        job = cls(connection=connection)
         job._func_name = '%s.%s' % (func.__module__, func.__name__)
         job._args = args
         job._kwargs = kwargs
@@ -89,7 +89,7 @@ class Job(object):
         """Fetches a persisted job from its corresponding Redis key and
         instantiates it.
         """
-        job = Job(id, connection=connection)
+        job = cls(id, connection=connection)
         job.refresh()
         return job
 
diff --git a/rq/queue.py b/rq/queue.py
index 6940b9b..3377be8 100644
--- a/rq/queue.py
+++ b/rq/queue.py
@@ -40,7 +40,7 @@ class Queue(object):
         if not queue_key.startswith(prefix):
             raise ValueError('Not a valid RQ queue key: %s' % (queue_key,))
         name = queue_key[len(prefix):]
-        return Queue(name, connection=connection)
+        return cls(name, connection=connection)
 
     def __init__(self, name='default', default_timeout=None, connection=None):
         if connection is None:
@@ -209,7 +209,7 @@ class Queue(object):
         if result is None:
             return None
         queue_key, job_id = result
-        queue = Queue.from_queue_key(queue_key, connection=connection)
+        queue = cls.from_queue_key(queue_key, connection=connection)
         try:
             job = Job.fetch(job_id, connection=connection)
         except NoSuchJobError:
diff --git a/rq/worker.py b/rq/worker.py
index ce368f1..fc8c790 100644
--- a/rq/worker.py
+++ b/rq/worker.py
@@ -73,7 +73,7 @@ class Worker(object):
             return None
 
         name = worker_key[len(prefix):]
-        worker = Worker([], name)
+        worker = cls([], name)
         queues = conn.hget(worker.key, 'queues')
         worker._state = conn.hget(worker.key, 'state') or '?'
         if queues: