diff --git a/hw/xfree86/os-support/xf86_OSlib.h b/hw/xfree86/os-support/xf86_OSlib.h
index 9161e181e..e931b09a1 100644
--- a/hw/xfree86/os-support/xf86_OSlib.h
+++ b/hw/xfree86/os-support/xf86_OSlib.h
@@ -171,7 +171,7 @@
 /**************************************************************************/
 /* Linux or Glibc-based system                                            */
 /**************************************************************************/
-#if defined(__linux__) || defined(__GLIBC__)
+#if defined(__linux__) || defined(__GLIBC__) || defined(__CYGWIN__)
 #include <sys/ioctl.h>
 #include <signal.h>
 #include <stdlib.h>