diff --git a/pretalx_musicrate/urls.py b/pretalx_musicrate/urls.py
index afbf7d6..211143a 100644
--- a/pretalx_musicrate/urls.py
+++ b/pretalx_musicrate/urls.py
@@ -1,4 +1,5 @@
-from django.urls import include, path
+from django.urls import include, path, re_path
+from pretalx.event.models.event import SLUG_REGEX
 
 from .views import (
     AssigneeView,
@@ -13,8 +14,8 @@ from .views import (
 )
 
 urlpatterns = [
-    path(
-        "orga/event/<slug:event>/",
+    re_path(
+        rf"^orga/event/(?P<event>{SLUG_REGEX})/",
         include(
             [
                 path(
@@ -39,8 +40,8 @@ urlpatterns = [
             ]
         ),
     ),
-    path(
-        "<slug:event>/p/pretalx_musicrate/",
+    re_path(
+        rf"^(?P<event>{SLUG_REGEX})/p/pretalx_musicrate/",
         include(
             [
                 path("", QRCodeView.as_view(), name="qrcode"),