ext/pycall/pycall_internal.h in pycall-1.1.0.rc1 vs ext/pycall/pycall_internal.h in pycall-1.2.0.beta1

@@ -527,9 +527,10 @@
   void (* Py_DecRef)(PyObject *);
 
   PyObject * (* _PyObject_New)(PyTypeObject *);
   int (* PyCallable_Check)(PyObject *);
   int (* PyObject_IsInstance)(PyObject *, PyObject *);
+  int (* PyObject_IsSubclass)(PyObject *, PyObject *);
   union {
     long      (* _long)(PyObject *);
     Py_hash_t (* _hash_t)(PyObject *);
   } PyObject_Hash;
   PyObject * (* PyObject_RichCompare)(PyObject *, PyObject *, int);