diff --git a/backend/apps/datasource/models/datasource.py b/backend/apps/datasource/models/datasource.py
index 793867a4..6a23e0b7 100644
--- a/backend/apps/datasource/models/datasource.py
+++ b/backend/apps/datasource/models/datasource.py
@@ -195,7 +195,7 @@ class PreviewResponse(BaseModel):
 
 
 class FieldInfo(BaseModel):
-    fieldName: str
+    fieldName: object
     fieldType: str