diff --git a/socket/socket_tcp6.c b/socket/socket_tcp6.c
index ba13533..71aa625 100644
--- a/socket/socket_tcp6.c
+++ b/socket/socket_tcp6.c
@@ -1,5 +1,6 @@
 #include <sys/types.h>
 #ifndef __MINGW32__
+#include <unistd.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
 #endif
@@ -7,6 +8,7 @@
 #include <errno.h>
 #include "haveip6.h"
 #include "socket.h"
+#include "ndelay.h"
 
 #ifndef EAFNOSUPPORT
 #define EAFNOSUPPORT EINVAL
diff --git a/socket/socket_udp6.c b/socket/socket_udp6.c
index 7259f33..14d6987 100644
--- a/socket/socket_udp6.c
+++ b/socket/socket_udp6.c
@@ -1,5 +1,6 @@
 #include <sys/types.h>
 #ifndef __MINGW32__
+#include <unistd.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
 #endif
@@ -7,6 +8,7 @@
 #include <errno.h>
 #include "haveip6.h"
 #include "socket.h"
+#include "ndelay.h"
 
 #ifndef EAFNOSUPPORT
 #define EAFNOSUPPORT EINVAL