diff --git a/compiler/cpp/src/generate/t_javame_generator.cc b/compiler/cpp/src/generate/t_javame_generator.cc
index 991bf78..6596ed5 100644
--- a/compiler/cpp/src/generate/t_javame_generator.cc
+++ b/compiler/cpp/src/generate/t_javame_generator.cc
@@ -2858,7 +2858,7 @@
   t_field kfield(tmap->get_key_type(), iter);
   generate_serialize_field(out, &kfield, "");
   string val_type = type_name(tmap->get_val_type(), true, false);
-  t_field vfield(tmap->get_val_type(), "(" + val_type + ")" + map + ".get(" + iter + ")");
+  t_field vfield(tmap->get_val_type(), "((" + val_type + ")" + map + ".get(" + iter + "))");
   generate_serialize_field(out, &vfield, "");
 }