diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0e3abcb9d..b90ca4a67 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -21,6 +21,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 
+- Fixed the validation of the data source field of an asset profile with market data
 - Fixed a recurring issue where single-value fields were incorrectly validated as arrays in various endpoints
 
 ## 3.18.0 - 2026-06-28
diff --git a/libs/common/src/lib/dtos/create-asset-profile-with-market-data.dto.ts b/libs/common/src/lib/dtos/create-asset-profile-with-market-data.dto.ts
index 04611371d..51ee716d3 100644
--- a/libs/common/src/lib/dtos/create-asset-profile-with-market-data.dto.ts
+++ b/libs/common/src/lib/dtos/create-asset-profile-with-market-data.dto.ts
@@ -1,12 +1,12 @@
 import { MarketData } from '@ghostfolio/common/interfaces';
 
 import { DataSource } from '@prisma/client';
-import { IsArray, IsEnum, IsOptional } from 'class-validator';
+import { IsArray, IsIn, IsOptional } from 'class-validator';
 
 import { CreateAssetProfileDto } from './create-asset-profile.dto';
 
 export class CreateAssetProfileWithMarketDataDto extends CreateAssetProfileDto {
-  @IsEnum([DataSource.MANUAL], {
+  @IsIn([DataSource.MANUAL], {
     message: `dataSource must be '${DataSource.MANUAL}'`
   })
   dataSource: DataSource;