diff --git a/src/pretix/base/migrations/0020_auto_20160421_1943.py b/src/pretix/base/migrations/0020_auto_20160421_1943.py
index c2390dc58d..b6e5143b88 100644
--- a/src/pretix/base/migrations/0020_auto_20160421_1943.py
+++ b/src/pretix/base/migrations/0020_auto_20160421_1943.py
@@ -3,6 +3,7 @@
 from __future__ import unicode_literals
 
 from django.db import migrations, models
+
 import pretix.base.i18n
 
 
diff --git a/src/pretix/base/signals.py b/src/pretix/base/signals.py
index 5d982f121d..46b8ed03e8 100644
--- a/src/pretix/base/signals.py
+++ b/src/pretix/base/signals.py
@@ -1,12 +1,11 @@
 import django.dispatch
 from django.apps import apps
+from django.conf import settings
 from django.dispatch.dispatcher import NO_RECEIVERS
 from typing import Any, Callable, List, Tuple
 
 from .models import Event
 
-CORE_MODULES = {("pretix", "base"), ("pretix", "presale"), ("pretix", "control")}
-
 
 class EventPluginSignal(django.dispatch.Signal):
     """
@@ -42,7 +41,7 @@ class EventPluginSignal(django.dispatch.Signal):
                 searchpath, mod = searchpath.rsplit(".", 1)
 
             # Only fire receivers from active plugins and core modules
-            if (searchpath, mod) in CORE_MODULES or (app and app.name in sender.get_plugins()):
+            if (searchpath, mod) in settings.CORE_MODULES or (app and app.name in sender.get_plugins()):
                 if not hasattr(app, 'compatibility_errors') or not app.compatibility_errors:
                     response = receiver(signal=self, sender=sender, **named)
                     responses.append((receiver, response))
diff --git a/src/pretix/settings.py b/src/pretix/settings.py
index dcf2d743d6..3ff04429f2 100644
--- a/src/pretix/settings.py
+++ b/src/pretix/settings.py
@@ -167,6 +167,12 @@ INSTALLED_APPS = [
 for entry_point in iter_entry_points(group='pretix.plugin', name=None):
     INSTALLED_APPS.append(entry_point.module_name)
 
+CORE_MODULES = {
+    ("pretix", "base"),
+    ("pretix", "presale"),
+    ("pretix", "control")
+}
+
 MIDDLEWARE_CLASSES = [
     'pretix.multidomain.middlewares.MultiDomainMiddleware',
     'pretix.multidomain.middlewares.SessionMiddleware',