diff -Nurp VirtualBox-4.3.0.p16/src/VBox/Additions/linux/drm/vbox_drv.c VirtualBox-4.3.0.p17/src/VBox/Additions/linux/drm/vbox_drv.c
--- VirtualBox-4.3.0.p16/src/VBox/Additions/linux/drm/vbox_drv.c	2013-10-15 14:03:39.000000000 +0300
+++ VirtualBox-4.3.0.p17/src/VBox/Additions/linux/drm/vbox_drv.c	2013-10-15 23:41:21.367277535 +0300
@@ -96,7 +96,9 @@ static const struct file_operations vbox
 	.unlocked_ioctl = drm_ioctl,
 	.mmap = vbox_mmap,
 	.poll = drm_poll,
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 12, 0)
 	.fasync = drm_fasync,
+#endif
 #ifdef CONFIG_COMPAT
 	.compat_ioctl = drm_compat_ioctl,
 #endif