diff --git a/psycopg/adapter_datetime.c b/psycopg/adapter_datetime.c
index b5135efb..a78311ee 100644
--- a/psycopg/adapter_datetime.c
+++ b/psycopg/adapter_datetime.c
@@ -93,12 +93,6 @@ error:
     return rv;
 }
 
-#ifndef PyDateTime_DELTA_GET_DAYS
-#define PyDateTime_DELTA_GET_DAYS(o) (o->days)
-#define PyDateTime_DELTA_GET_SECONDS(o) (o->seconds)
-#define PyDateTime_DELTA_GET_MICROSECONDS(o) (o->microseconds)
-#endif
-
 static PyObject *
 _pydatetime_string_delta(pydatetimeObject *self)
 {
diff --git a/psycopg/python.h b/psycopg/python.h
index cfb8dad3..1358ef74 100644
--- a/psycopg/python.h
+++ b/psycopg/python.h
@@ -93,6 +93,7 @@ typedef unsigned long Py_uhash_t;
 #ifndef PyNumber_Int
 #define PyNumber_Int           PyNumber_Long
 #endif
+
 #endif  /* PY_MAJOR_VERSION > 2 */
 
 #if PY_MAJOR_VERSION < 3
@@ -110,6 +111,10 @@ typedef unsigned long Py_uhash_t;
 #define Bytes_ConcatAndDel PyString_ConcatAndDel
 #define _Bytes_Resize _PyString_Resize
 
+#define PyDateTime_DELTA_GET_DAYS(o)         (((PyDateTime_Delta*)o)->days)
+#define PyDateTime_DELTA_GET_SECONDS(o)      (((PyDateTime_Delta*)o)->seconds)
+#define PyDateTime_DELTA_GET_MICROSECONDS(o) (((PyDateTime_Delta*)o)->microseconds)
+
 #else
 
 #define Bytes_Type PyBytes_Type