diff --git a/src/pretix/base/models.py b/src/pretix/base/models.py
index 7ffb11af31..342980ddd8 100644
--- a/src/pretix/base/models.py
+++ b/src/pretix/base/models.py
@@ -309,7 +309,7 @@ class Organizer(Versionable):
         max_length=50, db_index=True,
         help_text=_(
             "Should be short, only contain lowercase letters and numbers, and must be unique among your events. "
-            + "This is being used in addresses and bank transfer references."),
+            "This is being used in addresses and bank transfer references."),
         validators=[
             RegexValidator(
                 regex="^[a-zA-Z0-9.-]+$",
@@ -406,7 +406,7 @@ class Event(Versionable):
         max_length=50, db_index=True,
         help_text=_(
             "Should be short, only contain lowercase letters and numbers, and must be unique among your events. "
-            + "This is being used in addresses and bank transfer references."),
+            "This is being used in addresses and bank transfer references."),
         validators=[
             RegexValidator(
                 regex="^[a-zA-Z0-9.-]+$",