diff --git a/pkg/op/verifier_id_token_hint_test.go b/pkg/op/verifier_id_token_hint_test.go
index 5d7f7a1..597e291 100644
--- a/pkg/op/verifier_id_token_hint_test.go
+++ b/pkg/op/verifier_id_token_hint_test.go
@@ -2,6 +2,7 @@ package op
 
 import (
 	"context"
+	"errors"
 	"testing"
 	"time"
 
@@ -57,6 +58,13 @@ func TestNewIDTokenHintVerifier(t *testing.T) {
 	}
 }
 
+func Test_IDTokenHintExpiredError(t *testing.T) {
+	var err error = IDTokenHintExpiredError{oidc.ErrExpired}
+	assert.True(t, errors.Unwrap(err) == oidc.ErrExpired)
+	assert.ErrorIs(t, err, oidc.ErrExpired)
+	assert.ErrorAs(t, err, &IDTokenHintExpiredError{})
+}
+
 func TestVerifyIDTokenHint(t *testing.T) {
 	verifier := &IDTokenHintVerifier{
 		Issuer:            tu.ValidIssuer,