diff --git a/webauthn-server-core/src/test/scala/com/yubico/webauthn/RegistrationTestData.scala b/webauthn-server-core/src/test/scala/com/yubico/webauthn/RegistrationTestData.scala
index 89c67f4f1..bd9346a40 100644
--- a/webauthn-server-core/src/test/scala/com/yubico/webauthn/RegistrationTestData.scala
+++ b/webauthn-server-core/src/test/scala/com/yubico/webauthn/RegistrationTestData.scala
@@ -911,7 +911,7 @@ case class RegistrationTestData(
       val newValue =
         RegistrationTestData.from(credential, keypair, attestationCertChain)
       newValue.copy(
-        assertion = newValue.assertion.map(_.regenerate(newValue))
+        assertion = assertion.map(_.regenerate(newValue))
       )
     })