diff --git a/srcs/requirements/nestjs/api_back/src/auth/42/authentication.service.ts b/srcs/requirements/nestjs/api_back/src/auth/42/authentication.service.ts
index b338ce7b..3d4098ac 100644
--- a/srcs/requirements/nestjs/api_back/src/auth/42/authentication.service.ts
+++ b/srcs/requirements/nestjs/api_back/src/auth/42/authentication.service.ts
@@ -24,10 +24,12 @@ export class AuthenticationService {
 		if (!check_name)
 			return await this.userService.create(createUsersDto);
 		let createUsersDtoWithUsername : CreateUsersDto = createUsersDto;
+		let i = 0;
 		while (check_name === true)
 		{
-			createUsersDtoWithUsername = { ...createUsersDto, username: createUsersDto.username + randomUUID() };
+			createUsersDtoWithUsername = { ...createUsersDto, username: createUsersDto.username + '_' + i};
 			check_name = await this.userService.isUsernameExists(createUsersDtoWithUsername.username);
+			i++;
 		}
 		return this.userService.create(createUsersDtoWithUsername);
 	}