diff --git a/apps/api/src/app/endpoints/watchlist/create-watchlist-item.dto.ts b/apps/api/src/app/endpoints/watchlist/create-watchlist-item.dto.ts
index ee2286727..663965ef1 100644
--- a/apps/api/src/app/endpoints/watchlist/create-watchlist-item.dto.ts
+++ b/apps/api/src/app/endpoints/watchlist/create-watchlist-item.dto.ts
@@ -2,7 +2,7 @@ import { DataSource } from '@prisma/client';
 import { IsEnum, IsString } from 'class-validator';
 
 export class CreateWatchlistItemDto {
-  @IsEnum(DataSource, { each: true })
+  @IsEnum(DataSource)
   dataSource: DataSource;
 
   @IsString()