diff --git a/packages/megalodon/src/entities/account.ts b/packages/megalodon/src/entities/account.ts
index 89c0f17c4..1c38863c6 100644
--- a/packages/megalodon/src/entities/account.ts
+++ b/packages/megalodon/src/entities/account.ts
@@ -15,6 +15,7 @@ namespace Entity {
     suspended: boolean | null
     limited: boolean | null
     created_at: string
+    createdAt: string | null
     followers_count: number
     following_count: number
     statuses_count: number
diff --git a/packages/megalodon/src/misskey/api_client.ts b/packages/megalodon/src/misskey/api_client.ts
index 880072438..e1e2fd525 100644
--- a/packages/megalodon/src/misskey/api_client.ts
+++ b/packages/megalodon/src/misskey/api_client.ts
@@ -88,6 +88,7 @@ namespace MisskeyAPI {
         suspended: null,
         limited: null,
         created_at: '',
+        createdAt: new Date().toUTCString(),
         followers_count: 0,
         following_count: 0,
         statuses_count: 0,
@@ -124,6 +125,7 @@ namespace MisskeyAPI {
         suspended: null,
         limited: null,
         created_at: u.createdAt ? u.createdAt : new Date().toUTCString(),
+        createdAt: u.createdAt ? u.createdAt : new Date().toUTCString(),
         followers_count: u.followersCount,
         following_count: u.followingCount,
         statuses_count: u.notesCount,