diff --git a/pyramid_tasks/__init__.py b/pyramid_tasks/__init__.py
index 75a07b2..6414a9c 100644
--- a/pyramid_tasks/__init__.py
+++ b/pyramid_tasks/__init__.py
@@ -39,7 +39,7 @@ def includeme(config):
     )
     config.action(
         ("celery", "finalize"),
-        config.registry["pyramid_tasks.app"].finalize,
+        _get_app(config.registry).finalize,
         order=PHASE2_CONFIG,
     )
     config.add_request_method(defer_task)
@@ -50,9 +50,13 @@ def includeme(config):
     config.include(".taskderivers")
 
 
+def _get_app(registry):
+    return registry["pyramid_tasks.app"]
+
+
 def make_celery_app(config):
     config.commit()
-    return config.registry["pyramid_tasks.app"]
+    return _get_app(config.registry)
 
 
 def register_task(config, func, name=None, **kwargs):
@@ -61,7 +65,7 @@ def register_task(config, func, name=None, **kwargs):
 
     """
     registry = config.registry
-    app = registry["pyramid_tasks.app"]
+    app = _get_app(registry)
     name = name or app.gen_task_name(func.__name__, func.__module__)
 
     def register():
@@ -116,8 +120,7 @@ def _get_task(registry, func_or_name):
     """
     task_map = registry["pyramid_tasks.task_map"]
     if isinstance(func_or_name, str):
-        celery_app = registry["pyramid_tasks.app"]
-        return celery_app.tasks[func_or_name]
+        return _get_app(registry).tasks[func_or_name]
     elif func_or_name in task_map:
         return task_map[func_or_name]
     else:
@@ -173,8 +176,13 @@ def add_periodic_task(
 
     def add():
         task = _get_task(config.registry, func_or_name)
-        app = config.registry["pyramid_tasks.app"]
-        app.add_periodic_task(schedule, task, args, kwargs, **opts)
+        _get_app(config.registry).add_periodic_task(
+            schedule,
+            task,
+            args,
+            kwargs,
+            **opts,
+        )
 
     config.action(None, add, order=PHASE3_CONFIG)
 
@@ -184,8 +192,7 @@ def get_task_result(request, task_id):
     Get a result object from celery.
 
     """
-    app = request.registry["pyramid_tasks.app"]
-    return app.AsyncResult(task_id)
+    return _get_app(request.registry).AsyncResult(task_id)
 
 
 def current_task(request):
@@ -193,5 +200,4 @@ def current_task(request):
     Return the task currently being executed.
 
     """
-    app = request.registry["pyramid_tasks.app"]
-    return app.current_worker_task
+    return _get_app(request.registry).current_worker_task