diff --git a/xobject.go b/xobject.go
index 2edfe93..fde7ab4 100644
--- a/xobject.go
+++ b/xobject.go
@@ -35,6 +35,9 @@ func (this *XObject) Size() int {
 	if (this._type == XOT_ARRAY) {
 		array := this._val.([]*XObject)
 		return len(array)
+	} else if (this._type == XOT_OBJECT) {
+		object := this._val.(map[string]*XObject)
+		return len(object)
 	} else {
 		panic("XObject.Size type error")
 		return 0