diff --git a/psycopg/adapter_datetime.c b/psycopg/adapter_datetime.c
index a78311ee..b5135efb 100644
--- a/psycopg/adapter_datetime.c
+++ b/psycopg/adapter_datetime.c
@@ -93,6 +93,12 @@ 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)
 {