run autoconf
diff --git a/pyconfig.h.in b/pyconfig.h.in
index f86621b..833f79e 100644
--- a/pyconfig.h.in
+++ b/pyconfig.h.in
@@ -1152,6 +1152,9 @@
 /* This must be defined on some systems to enable large file support. */
 #undef _LARGEFILE_SOURCE
 
+/* This must be defined on AIX systems to enable large file support. */
+#undef _LARGE_FILES
+
 /* Define to 1 if on MINIX. */
 #undef _MINIX