diff --git a/Include/longobject.h b/Include/longobject.h
index 4dc2e18..6bc8275 100644
--- a/Include/longobject.h
+++ b/Include/longobject.h
@@ -43,15 +43,15 @@
 
 /* Issue #1983: pid_t can be longer than a C long on some systems */
 #if !defined(SIZEOF_PID_T) || SIZEOF_PID_T == SIZEOF_INT
-#define PARSE_PID "i"
+#define _Py_PARSE_PID "i"
 #define PyLong_FromPid PyLong_FromLong
 #define PyLong_AsPid PyLong_AsLong
 #elif SIZEOF_PID_T == SIZEOF_LONG
-#define PARSE_PID "l"
+#define _Py_PARSE_PID "l"
 #define PyLong_FromPid PyLong_FromLong
 #define PyLong_AsPid PyLong_AsLong
 #elif defined(SIZEOF_LONG_LONG) && SIZEOF_PID_T == SIZEOF_LONG_LONG
-#define PARSE_PID "L"
+#define _Py_PARSE_PID "L"
 #define PyLong_FromPid PyLong_FromLongLong
 #define PyLong_AsPid PyLong_AsLongLong
 #else