diff --git a/zerver/lib/actions.py b/zerver/lib/actions.py
index c9f3f3744a..b89b94e309 100644
--- a/zerver/lib/actions.py
+++ b/zerver/lib/actions.py
@@ -2832,7 +2832,7 @@ def do_change_bot_owner(user_profile: UserProfile, bot_owner: UserProfile,
     user_profile.save()  # Can't use update_fields because of how the foreign key works.
     event_time = timezone_now()
     RealmAuditLog.objects.create(realm=user_profile.realm, acting_user=acting_user,
-                                 modified_user=user_profile, event_type='bot_owner_changed',
+                                 modified_user=user_profile, event_type=RealmAuditLog.BOT_OWNER_CHANGED,
                                  event_time=event_time)
 
     update_users = bot_owner_user_ids(user_profile)
diff --git a/zerver/models.py b/zerver/models.py
index b49c2e9b72..e956c5d424 100644
--- a/zerver/models.py
+++ b/zerver/models.py
@@ -1976,6 +1976,8 @@ class RealmAuditLog(models.Model):
     REALM_DEACTIVATED = 'realm_deactivated'
     REALM_REACTIVATED = 'realm_reactivated'
 
+    BOT_OWNER_CHANGED = 'bot_owner_changed'
+
     event_type = models.CharField(max_length=40)  # type: str
 
     def __str__(self) -> str:
diff --git a/zerver/tests/test_audit_log.py b/zerver/tests/test_audit_log.py
index 6f5b6d89fe..4f6c363e0e 100644
--- a/zerver/tests/test_audit_log.py
+++ b/zerver/tests/test_audit_log.py
@@ -88,7 +88,7 @@ class TestRealmAuditLog(ZulipTestCase):
         bot = self.notification_bot()
         bot_owner = self.example_user('hamlet')
         do_change_bot_owner(bot, bot_owner, admin)
-        self.assertEqual(RealmAuditLog.objects.filter(event_type='bot_owner_changed',
+        self.assertEqual(RealmAuditLog.objects.filter(event_type=RealmAuditLog.BOT_OWNER_CHANGED,
                                                       event_time__gte=now).count(), 1)
         self.assertEqual(bot_owner, bot.bot_owner)