diff --git a/tests/test_marshal_types_struct.py b/tests/test_marshal_types_struct.py
index 6ae6573..8ca2cde 100644
--- a/tests/test_marshal_types_struct.py
+++ b/tests/test_marshal_types_struct.py
@@ -248,21 +248,21 @@ class Foo(proto.Message):
 def test_struct_nested():
     class Foo(proto.Message):
         struct_field: struct_pb2.Struct = proto.Field(
-        proto.MESSAGE,
-        number=1,
-        message=struct_pb2.Struct,
-    )
+            proto.MESSAGE,
+            number=1,
+            message=struct_pb2.Struct,
+        )
 
     class Bar(proto.Message):
         foo_field: Foo = proto.Field(
-        proto.MESSAGE,
-        number=1,
-        message=Foo,
-    )
-        
+            proto.MESSAGE,
+            number=1,
+            message=Foo,
+        )
+
     foo = Foo({"struct_field": {"foo": "bagel"}})
     assert foo.struct_field == {"foo": "bagel"}
-    
+
     bar = Bar({"foo_field": {"struct_field": {"foo": "cheese"}}})
     assert bar.foo_field == Foo({"struct_field": {"foo": "cheese"}})
     assert bar.foo_field.struct_field == {"foo": "cheese"}