diff --git a/libc/kernel/uapi/linux/vboxguest.h b/libc/kernel/uapi/linux/vboxguest.h
index 2eb80ef..d9dfa9a 100644
--- a/libc/kernel/uapi/linux/vboxguest.h
+++ b/libc/kernel/uapi/linux/vboxguest.h
@@ -53,7 +53,7 @@
 };
 #define VBG_IOCTL_DRIVER_VERSION_INFO _IOWR('V', 0, struct vbg_ioctl_driver_version_info)
 #define VBG_IOCTL_VMMDEV_REQUEST(s) _IOC(_IOC_READ | _IOC_WRITE, 'V', 2, s)
-#define VBG_IOCTL_VMMDEV_REQUEST_BIG _IOC(_IOC_READ | _IOC_WRITE, 'V', 3, 0)
+#define VBG_IOCTL_VMMDEV_REQUEST_BIG _IO('V', 3)
 struct vbg_ioctl_hgcm_connect {
   struct vbg_ioctl_hdr hdr;
   union {
@@ -99,7 +99,7 @@
     } in;
   } u;
 };
-#define VBG_IOCTL_LOG(s) _IOC(_IOC_READ | _IOC_WRITE, 'V', 9, s)
+#define VBG_IOCTL_LOG(s) _IO('V', 9)
 struct vbg_ioctl_wait_for_events {
   struct vbg_ioctl_hdr hdr;
   union {