diff --git a/internal/domain/site.go b/internal/domain/site.go
index 5662ffe..77fcc92 100644
--- a/internal/domain/site.go
+++ b/internal/domain/site.go
@@ -54,6 +54,7 @@ func TestSite(tb testing.TB) *Site {
 					"values": map[string]any{
 						"Link": `<https://auth.example.com/>; rel="indieauth-metadata", ` +
 							`<https://pub.example.com/>; rel="micropub"`,
+						"X-Koroko": "Ya-ha-ha!",
 					},
 				}, map[string]any{
 					"path": "/foo/bar",
diff --git a/internal/server/usecase/server_ucase_test.go b/internal/server/usecase/server_ucase_test.go
index ab67dbf..29f1a18 100644
--- a/internal/server/usecase/server_ucase_test.go
+++ b/internal/server/usecase/server_ucase_test.go
@@ -26,6 +26,7 @@ func TestDo(t *testing.T) {
 			Headers: map[string]string{
 				"Link": `<https://auth.example.com/>; rel="indieauth-metadata", ` +
 					`<https://pub.example.com/>; rel="micropub"`,
+				"X-Koroko": "Ya-ha-ha!",
 			},
 		}, {
 			Path: "/foo/bar",