diff --git a/packages/backend/src/server/api/SignupApiService.ts b/packages/backend/src/server/api/SignupApiService.ts
index 06b8b29134..6552dac4bf 100644
--- a/packages/backend/src/server/api/SignupApiService.ts
+++ b/packages/backend/src/server/api/SignupApiService.ts
@@ -10,6 +10,7 @@ import { IdService } from '@/core/IdService.js';
 import { SignupService } from '@/core/SignupService.js';
 import { UserEntityService } from '@/core/entities/UserEntityService.js';
 import { EmailService } from '@/core/EmailService.js';
+import { ILocalUser } from '@/models/entities/User.js';
 import { SigninService } from './SigninService.js';
 import type Koa from 'koa';
 
@@ -117,7 +118,7 @@ export class SignupApiService {
 	
 			const link = `${this.config.url}/signup-complete/${code}`;
 	
-			sendEmail(emailAddress, 'Signup',
+			this.emailService.sendEmail(emailAddress, 'Signup',
 				`To complete signup, please click this link:<br><a href="${link}">${link}</a>`,
 				`To complete signup, please click this link: ${link}`);
 	
@@ -167,7 +168,7 @@ export class SignupApiService {
 				emailVerifyCode: null,
 			});
 
-			this.signinService.signin(ctx, account);
+			this.signinService.signin(ctx, account as ILocalUser);
 		} catch (e) {
 			ctx.throw(400, e);
 		}