diff --git a/a8/xobject.cc b/a8/xobject.cc
index 6d9b29a..d60498b 100644
--- a/a8/xobject.cc
+++ b/a8/xobject.cc
@@ -21,7 +21,7 @@ namespace a8
     XObject::XObject(const a8::XObject& v)
     {
         type_ = XOT_SIMPLE;
-        value_.x_value = nullptr;
+        value_.x_value = new a8::XValue();
         *this = v;
     }