diff --git a/src/pretix/base/models/event.py b/src/pretix/base/models/event.py
index acd63b5bb0..133459aec4 100644
--- a/src/pretix/base/models/event.py
+++ b/src/pretix/base/models/event.py
@@ -294,7 +294,7 @@ class Event(EventMixin, LoggedModel):
             "This will be used in URLs, order codes, invoice numbers, and bank transfer references."),
         validators=[
             RegexValidator(
-                regex="^[a-zA-Z0-9][a-zA-Z0-9.-]+$",
+                regex="^[a-zA-Z0-9][a-zA-Z0-9.-]*$",
                 message=_("The slug may only contain letters, numbers, dots and dashes."),
             ),
             EventSlugBanlistValidator()