diff --git a/fmacros.h b/fmacros.h
index 4cdbc13..3227faa 100644
--- a/fmacros.h
+++ b/fmacros.h
@@ -1,38 +1,12 @@
 #ifndef __HIREDIS_FMACRO_H
 #define __HIREDIS_FMACRO_H
 
-#if defined(__linux__)
-#define _BSD_SOURCE
-#define _DEFAULT_SOURCE
-#endif
-
-#if defined(__CYGWIN__)
-#include <sys/cdefs.h>
-#endif
-
-#if defined(__linux__) || defined(__OpenBSD__) || defined(__NetBSD__)
 #define _XOPEN_SOURCE 600
-#elif defined(__APPLE__) && defined(__MACH__)
-#define _XOPEN_SOURCE
-#elif defined(__FreeBSD__)
-// intentionally left blank, don't define _XOPEN_SOURCE
-#elif defined(AIX)
-// intentionally left blank, don't define _XOPEN_SOURCE
-#else
-#define _XOPEN_SOURCE
-#endif
-
-#if defined(__sun__)
 #define _POSIX_C_SOURCE 200112L
-#endif
 
 #if defined(__APPLE__) && defined(__MACH__)
-#define _OSX
-#endif
-
-#ifndef AIX
-# define _XOPEN_SOURCE_EXTENDED 1
-# define _ALL_SOURCE
+/* Enable TCP_KEEPALIVE */
+#define _DARWIN_C_SOURCE
 #endif
 
 #endif
diff --git a/net.c b/net.c
index 99f647d..44f2575 100644
--- a/net.c
+++ b/net.c
@@ -136,7 +136,7 @@ int redisKeepAlive(redisContext *c, int interval) {
 
     val = interval;
 
-#ifdef _OSX
+#if defined(__APPLE__) && defined(__MACH__)
     if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPALIVE, &val, sizeof(val)) < 0) {
         __redisSetError(c,REDIS_ERR_OTHER,strerror(errno));
         return REDIS_ERR;