diff --git a/packages/backend/src/core/UserKeypairService.ts b/packages/backend/src/core/UserKeypairService.ts
index 72d035b1a4ab..6074b8a5aa19 100644
--- a/packages/backend/src/core/UserKeypairService.ts
+++ b/packages/backend/src/core/UserKeypairService.ts
@@ -141,7 +141,7 @@ export class UserKeypairService implements OnApplicationShutdown {
 	 * @returns MiUserKeypair if keypair is created, void if keypair is already exists
 	 */
 	@bindThis
-	public async refreshAndprepareEd25519KeyPair(userId: MiUser['id']): Promise<MiUserKeypair | void> {
+	public async refreshAndPrepareEd25519KeyPair(userId: MiUser['id']): Promise<MiUserKeypair | void> {
 		await this.refresh(userId);
 		const keypair = await this.keypairEntityCache.fetch(userId);
 		if (keypair.ed25519PublicKey != null) {
diff --git a/packages/backend/src/core/activitypub/ApDeliverManagerService.ts b/packages/backend/src/core/activitypub/ApDeliverManagerService.ts
index e09b548d3a8f..decb02156131 100644
--- a/packages/backend/src/core/activitypub/ApDeliverManagerService.ts
+++ b/packages/backend/src/core/activitypub/ApDeliverManagerService.ts
@@ -135,7 +135,7 @@ class DeliverManager {
 			/**
 			 * ed25519の署名がなければ追加する
 			 */
-			const created = await this.userKeypairService.refreshAndprepareEd25519KeyPair(this.actor.id);
+			const created = await this.userKeypairService.refreshAndPrepareEd25519KeyPair(this.actor.id);
 			if (created) {
 				// createdが存在するということは新規作成されたということなので、フォロワーに配信する
 				this.logger.info(`ed25519 key pair created for user ${this.actor.id} and publishing to followers`);