diff --git a/test/ThriftTest.thrift b/test/ThriftTest.thrift
index 7049d51..3faaa6a 100644
--- a/test/ThriftTest.thrift
+++ b/test/ThriftTest.thrift
@@ -113,6 +113,7 @@
 
 struct VersioningTestV1 {
        1: i32 begin_in_both,
+       3: string old_string,
        12: i32 end_in_both
 }
 
diff --git a/test/py/SerializationTest.py b/test/py/SerializationTest.py
index a99bce6..296a50a 100755
--- a/test/py/SerializationTest.py
+++ b/test/py/SerializationTest.py
@@ -16,6 +16,7 @@
   def setUp(self):
       self.v1obj = VersioningTestV1(
           begin_in_both=12345,
+          old_string='aaa',
           end_in_both=54321,
           )