--- a/Include/datetime.h
+++ b/Include/datetime.h.new
@@ -164,26 +164,7 @@
 /* "magic" constant used to partially protect against developer mistakes. */
 #define DATETIME_API_MAGIC 0x414548d5
 
-#ifdef Py_BUILD_CORE
 
-/* Macros for type checking when building the Python core. */
-#define PyDate_Check(op) PyObject_TypeCheck(op, &PyDateTime_DateType)
-#define PyDate_CheckExact(op) (Py_TYPE(op) == &PyDateTime_DateType)
-
-#define PyDateTime_Check(op) PyObject_TypeCheck(op, &PyDateTime_DateTimeType)
-#define PyDateTime_CheckExact(op) (Py_TYPE(op) == &PyDateTime_DateTimeType)
-
-#define PyTime_Check(op) PyObject_TypeCheck(op, &PyDateTime_TimeType)
-#define PyTime_CheckExact(op) (Py_TYPE(op) == &PyDateTime_TimeType)
-
-#define PyDelta_Check(op) PyObject_TypeCheck(op, &PyDateTime_DeltaType)
-#define PyDelta_CheckExact(op) (Py_TYPE(op) == &PyDateTime_DeltaType)
-
-#define PyTZInfo_Check(op) PyObject_TypeCheck(op, &PyDateTime_TZInfoType)
-#define PyTZInfo_CheckExact(op) (Py_TYPE(op) == &PyDateTime_TZInfoType)
-
-#else
-
 /* Define global variable for the C API and a macro for setting it. */
 static PyDateTime_CAPI *PyDateTimeAPI = NULL;
 
@@ -231,7 +212,7 @@
     PyDateTimeAPI->Date_FromTimestamp( \
         (PyObject*) (PyDateTimeAPI->DateType), args)
 
-#endif  /* Py_BUILD_CORE */
+/* Py_BUILD_CORE */
 
 #ifdef __cplusplus
 }