diff --git a/java/src/main/java/org/msgpack/template/builder/BeansTemplateBuilder.java b/java/src/main/java/org/msgpack/template/builder/BeansTemplateBuilder.java
index 57634660..cc81f6b1 100644
--- a/java/src/main/java/org/msgpack/template/builder/BeansTemplateBuilder.java
+++ b/java/src/main/java/org/msgpack/template/builder/BeansTemplateBuilder.java
@@ -153,7 +153,7 @@ public class BeansTemplateBuilder extends CustomTemplateBuilder{
 					}
 					pk.packNil();
 				} else {
-					pk.pack(obj);
+				    e.pack(obj, pk);
 				}
 			}