diff --git a/src/intTest/kotlin/activitypub/webfinger/WebFingerTest.kt b/src/intTest/kotlin/activitypub/webfinger/WebFingerTest.kt
index abee25d6..8e0b0294 100644
--- a/src/intTest/kotlin/activitypub/webfinger/WebFingerTest.kt
+++ b/src/intTest/kotlin/activitypub/webfinger/WebFingerTest.kt
@@ -55,7 +55,7 @@ class WebFingerTest {
     @Test
     fun `webfinger 存在しないユーザーに404`() {
         mockMvc
-            .get("/.well-known/webfinger?resource=acct:test-user@example.com")
+            .get("/.well-known/webfinger?resource=acct:invalid-user-notfound-afdjashfal@example.com")
             .andExpect { status { isNotFound() } }
     }