diff --git a/javaobj/v1/marshaller.py b/javaobj/v1/marshaller.py
index 92b376e..ccc234c 100644
--- a/javaobj/v1/marshaller.py
+++ b/javaobj/v1/marshaller.py
@@ -537,6 +537,8 @@ def _write_value(self, raw_field_type, value):
                 self.write_object(value)
             elif isinstance(value, JavaString):
                 self.write_string(value)
+            elif isinstance(value, JavaClass):
+                self.write_class(value)
             elif isinstance(value, (BYTES_TYPE, UNICODE_TYPE)):
                 self.write_blockdata(value)
             else: