diff --git a/lib/webauthn_components/authentication_component.ex b/lib/webauthn_components/authentication_component.ex
index 87a3407..383cc8f 100644
--- a/lib/webauthn_components/authentication_component.ex
+++ b/lib/webauthn_components/authentication_component.ex
@@ -139,7 +139,7 @@ defmodule WebauthnComponents.AuthenticationComponent do
 
     challenge =
       Wax.new_authentication_challenge(
-        origin: endpoint.url,
+        origin: endpoint.url(),
         rp_id: :auto,
         user_verification: "preferred"
       )
diff --git a/lib/webauthn_components/registration_component.ex b/lib/webauthn_components/registration_component.ex
index d810dbf..ee96a6b 100644
--- a/lib/webauthn_components/registration_component.ex
+++ b/lib/webauthn_components/registration_component.ex
@@ -126,7 +126,7 @@ defmodule WebauthnComponents.RegistrationComponent do
     challenge =
       Wax.new_registration_challenge(
         attestation: attestation,
-        origin: endpoint.url,
+        origin: endpoint.url(),
         rp_id: :auto,
         trusted_attestation_types: [:none, :basic]
       )