diff --git a/ext/socket/getnameinfo.c b/ext/socket/getnameinfo.c
index 3ee83eb2a0..d1d5ff6c73 100644
--- a/ext/socket/getnameinfo.c
+++ b/ext/socket/getnameinfo.c
@@ -114,9 +114,6 @@ static struct afd {
 #define ENI_FAMILY	5
 #define ENI_SALEN	6
 
-#ifdef __HAIKU__
-#define HAVE_INET_NTOP
-#endif
 #ifndef HAVE_INET_NTOP
 static const char *
 inet_ntop(int af, const void *addr, char *numaddr, size_t numaddr_len)
diff --git a/ext/socket/option.c b/ext/socket/option.c
index e58d51850c..2f5142d062 100644
--- a/ext/socket/option.c
+++ b/ext/socket/option.c
@@ -433,9 +433,6 @@ inspect_timeval_as_interval(int level, int optname, VALUE data, VALUE ret)
  * it is not distinguishable by the size.
  */
 
-#ifdef __HAIKU__
-#define HAVE_INET_NTOP
-#endif
 #ifndef HAVE_INET_NTOP
 static char *
 inet_ntop(int af, const void *addr, char *numaddr, size_t numaddr_len)