diff --git a/packages/backend/src/server/ServerService.ts b/packages/backend/src/server/ServerService.ts
index 16bcfc7459..aaed447253 100644
--- a/packages/backend/src/server/ServerService.ts
+++ b/packages/backend/src/server/ServerService.ts
@@ -186,6 +186,17 @@ export class ServerService implements OnApplicationShutdown {
 			}
 		});
 
+		fastify.get('/oauth/authorize', async (request, reply) => {
+			const query: any = request.query;
+			let param = "mastodon=true";
+			if (query.state) param += `&state=${query.state}`;
+			if (query.redirect_uri) param += `&redirect_uri=${query.redirect_uri}`;
+			const client = query.client_id ? query.client_id : "";
+			reply.redirect(
+				`${Buffer.from(client.toString(), 'base64').toString()}?${param}`,
+			);
+		});
+
 		fastify.get<{ Params: { code: string } }>('/verify-email/:code', async (request, reply) => {
 			const profile = await this.userProfilesRepository.findOneBy({
 				emailVerifyCode: request.params.code,
diff --git a/packages/backend/src/server/oauth/OAuth2ProviderService.ts b/packages/backend/src/server/oauth/OAuth2ProviderService.ts
index 6d9cac2a17..8cd49d3487 100644
--- a/packages/backend/src/server/oauth/OAuth2ProviderService.ts
+++ b/packages/backend/src/server/oauth/OAuth2ProviderService.ts
@@ -67,25 +67,6 @@ export class OAuth2ProviderService {
 			payload.on('error', done);
 		});
 
-		fastify.get('/oauth/authorize', async (request, reply) => {
-			const query: any = request.query;
-			let param = "mastodon=true";
-			if (query.state) param += `&state=${query.state}`;
-			if (query.redirect_uri) param += `&redirect_uri=${query.redirect_uri}`;
-			const client = query.client_id ? query.client_id : "";
-			reply.redirect(
-				`${Buffer.from(client.toString(), 'base64').toString()}?${param}`,
-			);
-		});
-
-		fastify.post('/oauth/decision', async (request, reply) => {
-			const body: any = request.body;
-			if (body.cancel) {
-				reply.send({ user: body.login_token, allow: false });
-			}
-			reply.send({ user: body.login_token, allow: true });
-		});
-
 		fastify.post('/oauth/token', async (request, reply) => {
 			const body: any = request.body || request.query;
 			if (body.grant_type === "client_credentials") {