diff --git a/Include/abstract.h b/Include/abstract.h
index a4b1bc3d656..0d6744db7c3 100644
--- a/Include/abstract.h
+++ b/Include/abstract.h
@@ -754,6 +754,12 @@ xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx*/
        */
 
      DL_IMPORT(int) PySequence_Contains Py_PROTO((PyObject *o, PyObject *value));
+
+/* For DLL-level backwards compatibility */
+#undef PySequence_In
+     DL_IMPORT(int) PySequence_In Py_PROTO((PyObject *o, PyObject *value));
+
+/* For source-level backwards compatibility */
 #define PySequence_In PySequence_Contains
 
        /*
diff --git a/Include/ceval.h b/Include/ceval.h
index 5b96d9e21ea..8200e3cd1b8 100644
--- a/Include/ceval.h
+++ b/Include/ceval.h
@@ -40,6 +40,10 @@ PERFORMANCE OF THIS SOFTWARE.
 DL_IMPORT(PyObject *) PyEval_CallObjectWithKeywords
 	Py_PROTO((PyObject *, PyObject *, PyObject *));
 
+/* DLL-level Backwards compatibility: */
+#undef PyEval_CallObject
+DL_IMPORT(PyObject *) PyEval_CallObject Py_PROTO((PyObject *, PyObject *));
+
 /* Inline this */
 #define PyEval_CallObject(func,arg) \
         PyEval_CallObjectWithKeywords(func, arg, (PyObject *)NULL)