diff --git a/source/gl_vidnt.c b/source/gl_vidnt.c
index 7df01e5..1e42f71 100644
--- a/source/gl_vidnt.c
+++ b/source/gl_vidnt.c
@@ -29,6 +29,7 @@
 
 #include "quakedef.h"
 #include "winquake.h"
+#include "sys.h"
 #include "resource.h"
 #include "glquake.h"
 #include "in_win.h"
diff --git a/source/net_wins.c b/source/net_wins.c
index e5e42f9..17d4289 100644
--- a/source/net_wins.c
+++ b/source/net_wins.c
@@ -28,6 +28,7 @@
 
 #include "quakedef.h"
 #include <windows.h>
+#include <sys.h>
 //#include "winquake.h"
 
 netadr_t	net_local_adr;
diff --git a/source/vid_win.c b/source/vid_win.c
index 5cd710d..c699e9f 100644
--- a/source/vid_win.c
+++ b/source/vid_win.c
@@ -29,6 +29,7 @@
 
 #include "quakedef.h"
 #include "winquake.h"
+#include "sys.h"
 #include "d_local.h"
 #include "resource.h"
 #include "in_win.h"