diff --git a/src/servala/core/models/organization.py b/src/servala/core/models/organization.py
index d308bfa..1669f39 100644
--- a/src/servala/core/models/organization.py
+++ b/src/servala/core/models/organization.py
@@ -485,7 +485,7 @@ class OrganizationInvitation(ServalaModelMixin, models.Model):
     def is_accepted(self):
         # We check both accepted_by and accepted_at to avoid a deleted user
         # freeing up an invitation
-        return self.accepted_by or self.accepted_at
+        return bool(self.accepted_by or self.accepted_at)
 
     @property
     def can_be_accepted(self):