diff --git a/packages/uipath/src/uipath/functions/type_conversion.py b/packages/uipath/src/uipath/functions/type_conversion.py
index 7ad3627a1..33417561a 100644
--- a/packages/uipath/src/uipath/functions/type_conversion.py
+++ b/packages/uipath/src/uipath/functions/type_conversion.py
@@ -92,7 +92,7 @@ def convert_from_class(obj: Any) -> dict[str, Any]:
 
     # Pydantic models
     if isinstance(obj, BaseModel):
-        return obj.model_dump()
+        return obj.model_dump(by_alias=True)
 
     # Dataclasses
     if is_dataclass(obj) and not isinstance(obj, type):
diff --git a/packages/uipath/tests/functions/test_output_serialization.py b/packages/uipath/tests/functions/test_output_serialization.py
new file mode 100644
index 000000000..7ad28fa98
--- /dev/null
+++ b/packages/uipath/tests/functions/test_output_serialization.py
@@ -0,0 +1,37 @@
+"""A function's output is serialized under the keys its output schema declares."""
+
+import uuid
+
+from pydantic import BaseModel
+
+from uipath.functions.type_conversion import convert_from_class
+from uipath.platform.attachments import Attachment
+
+
+class Output(BaseModel):
+    file: Attachment
+
+
+def test_aliased_fields_are_serialized_by_alias():
+    attachment_id = uuid.uuid4()
+    output = Output(
+        file=Attachment(
+            id=attachment_id, full_name="report.md", mime_type="text/markdown"
+        )
+    )
+
+    assert convert_from_class(output) == {
+        "file": {
+            "ID": attachment_id,
+            "FullName": "report.md",
+            "MimeType": "text/markdown",
+            "Metadata": None,
+        }
+    }
+
+
+def test_models_without_aliases_are_unchanged():
+    class Plain(BaseModel):
+        summary: str
+
+    assert convert_from_class(Plain(summary="ok")) == {"summary": "ok"}