diff --git a/Include/object.h b/Include/object.h
index e5544e8b588..348bf42260a 100644
--- a/Include/object.h
+++ b/Include/object.h
@@ -83,7 +83,7 @@ typedef struct _typeobject PyTypeObject;
 
 #define PyObject_HEAD_INIT(type)        \
     { _PyObject_EXTRA_INIT              \
-    1, type },
+    1, type, NULL },
 
 #define PyVarObject_HEAD_INIT(type, size)       \
     { PyObject_HEAD_INIT(type) size },
@@ -106,6 +106,7 @@ typedef struct _object {
     _PyObject_HEAD_EXTRA
     Py_ssize_t ob_refcnt;
     PyTypeObject *ob_type;
+    void *ob_interp;
 } PyObject;
 
 /* Cast argument to PyObject* type. */
diff --git a/Objects/object.c b/Objects/object.c
index 124485d64ab..79b713c919d 100644
--- a/Objects/object.c
+++ b/Objects/object.c
@@ -379,6 +379,7 @@ _PyObject_Dump(PyObject* op)
     }
 
     /* first, write fields which are the least likely to crash */
+    fprintf(stderr, "object interp   : %p\n", op->ob_interp);
     fprintf(stderr, "object address  : %p\n", (void *)op);
     /* XXX(twouters) cast refcount to long until %zd is
        universally available */
@@ -1956,6 +1957,7 @@ _Py_NewReference(PyObject *op)
 #ifdef Py_TRACE_REFS
     _Py_AddToAllObjects(op, 1);
 #endif
+    op->ob_interp = _PyInterpreterState_GET();
 }