diff --git a/config.h b/config.h
index 9f614f8c..b25bea31 100644
--- a/config.h
+++ b/config.h
@@ -7,8 +7,6 @@
 #ifdef __APPLE__
 #  define __DARWIN_C_SOURCE
 #elif defined(__FreeBSD__) || defined(__NetBSD__) || defined(__SYMBIAN32__)
-#  define _XOPEN_SOURCE 700
-#  define __BSD_VISIBLE 1
 #  define HAVE_NETINET_IN_H
 #elif defined(__QNX__)
 #  define _XOPEN_SOURCE 600