diff --git a/packages/megalodon/src/entities/account.ts b/packages/megalodon/src/entities/account.ts
index 89c0f17c4b..96d10909be 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
     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 f7ecb3bd5b..926c0da2ab 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: '',
         followers_count: 0,
         following_count: 0,
         statuses_count: 0,
@@ -124,6 +125,7 @@ namespace MisskeyAPI {
         suspended: null,
         limited: null,
         created_at: u.createdAt,
+        createdAt: u.createdAt,
         followers_count: u.followersCount,
         following_count: u.followingCount,
         statuses_count: u.notesCount,