diff --git a/logfire/_internal/json_encoder.py b/logfire/_internal/json_encoder.py
index df72e846..f0d13e72 100644
--- a/logfire/_internal/json_encoder.py
+++ b/logfire/_internal/json_encoder.py
@@ -241,12 +241,12 @@ def to_json_value(o: Any, seen: set[int]) -> JsonValue:
             return {
                 key if isinstance(key, str) else safe_repr(key): to_json_value(value, seen) for key, value in o.items()
             }  # type: ignore
+        elif is_sqlalchemy(o):
+            return _get_sqlalchemy_data(o, seen)
         elif dataclasses.is_dataclass(o):
             return {f.name: to_json_value(getattr(o, f.name), seen) for f in dataclasses.fields(o)}
         elif is_attrs(o):
             return _get_attrs_data(o, seen)
-        elif is_sqlalchemy(o):
-            return _get_sqlalchemy_data(o, seen)
 
         # Check the class type and its superclasses for a matching encoder
         for base in o.__class__.__mro__[:-1]:
diff --git a/logfire/_internal/json_schema.py b/logfire/_internal/json_schema.py
index 75cebc8a..df7020fd 100644
--- a/logfire/_internal/json_schema.py
+++ b/logfire/_internal/json_schema.py
@@ -116,12 +116,12 @@ def create_json_schema(obj: Any, seen: set[int]) -> JsonDict:
         return _array_schema(obj, seen)
     elif isinstance(obj, Mapping):
         return _mapping_schema(obj, seen)
+    elif is_sqlalchemy(obj):
+        return _sqlalchemy_schema(obj, seen)
     elif dataclasses.is_dataclass(obj):
         return _dataclass_schema(obj, seen)
     elif is_attrs(obj):
         return _attrs_schema(obj, seen)
-    elif is_sqlalchemy(obj):
-        return _sqlalchemy_schema(obj, seen)
 
     global _type_to_schema
     _type_to_schema = _type_to_schema or type_to_schema()
diff --git a/tests/test_json_args.py b/tests/test_json_args.py
index daf0871f..54e3f14c 100644
--- a/tests/test_json_args.py
+++ b/tests/test_json_args.py
@@ -18,12 +18,13 @@
 import pandas
 import pytest
 from attrs import define
-from dirty_equals import IsJson, IsStr
+from dirty_equals import IsJson
 from inline_snapshot import snapshot
 from pydantic import AnyUrl, BaseModel, ConfigDict, FilePath, NameEmail, SecretBytes, SecretStr
 from pydantic.dataclasses import dataclass as pydantic_dataclass
 from sqlalchemy import String, create_engine
 from sqlalchemy.orm import DeclarativeBase, Mapped, Session, mapped_column
+from sqlalchemy.orm.decl_api import MappedAsDataclass
 
 import logfire
 from logfire.testing import TestExporter
@@ -829,7 +830,7 @@ def test_log_non_scalar_args(
 
 
 def test_log_sqlalchemy_class(exporter: TestExporter) -> None:
-    class Base(DeclarativeBase):
+    class Base(MappedAsDataclass, DeclarativeBase):
         pass
 
     class Model(Base):
@@ -903,9 +904,7 @@ def __init__(self, id: int, name: str):
                     'logfire.span_type': 'log',
                     'logfire.level_num': 9,
                     'logfire.msg_template': 'test message {var=}',
-                    'logfire.msg': IsStr(
-                        regex='test message var=<tests.test_json_args.test_log_sqlalchemy_class.<locals>.Model object at .*'
-                    ),
+                    'logfire.msg': "test message var=test_log_sqlalchemy_class.<locals>.Model(id=1, name='test name')",
                     'code.filepath': 'test_json_args.py',
                     'code.function': 'test_log_sqlalchemy_class',
                     'code.lineno': 123,