diff --git a/src/lib/empthread/ntthread.c b/src/lib/empthread/ntthread.c
index 87a135f0..edb80e5b 100644
--- a/src/lib/empthread/ntthread.c
+++ b/src/lib/empthread/ntthread.c
@@ -51,7 +51,6 @@
 #include <stdio.h>
 #include <sys/types.h>
 #include <time.h>
-#define WIN32
 #include <winsock2.h>
 #undef NS_ALL
 #include <windows.h>
diff --git a/src/lib/gen/io.c b/src/lib/gen/io.c
index fa57735e..7d87c330 100644
--- a/src/lib/gen/io.c
+++ b/src/lib/gen/io.c
@@ -46,7 +46,6 @@
 #include <stdlib.h>
 #include <sys/types.h>
 #ifdef _WIN32
-#define WIN32
 #include <winsock2.h>
 #undef NS_ALL
 #else
diff --git a/src/lib/gen/tcp_listen.c b/src/lib/gen/tcp_listen.c
index cd8c43c0..0637f83a 100644
--- a/src/lib/gen/tcp_listen.c
+++ b/src/lib/gen/tcp_listen.c
@@ -39,7 +39,6 @@
 #include <stdlib.h>
 #include <string.h>
 #ifdef _WIN32
-#define WIN32
 #include "winsock2.h"
 #undef NS_ALL
 #else
diff --git a/src/lib/player/accept.c b/src/lib/player/accept.c
index a1c07459..fa52d850 100644
--- a/src/lib/player/accept.c
+++ b/src/lib/player/accept.c
@@ -35,7 +35,6 @@
 #include <config.h>
 
 #ifdef _WIN32
-#define WIN32
 #include <winsock2.h>
 #undef NS_ALL
 #ifndef __GNUC__