diff --git a/libc/kernel/uapi/linux/blkdev.h b/libc/kernel/uapi/linux/blkdev.h
new file mode 100644
index 0000000..103fa0f
--- /dev/null
+++ b/libc/kernel/uapi/linux/blkdev.h
@@ -0,0 +1,12 @@
+/*
+ * This file is auto-generated. Modifications will be lost.
+ *
+ * See https://android.googlesource.com/platform/bionic/+/master/libc/kernel/
+ * for more information.
+ */
+#ifndef _UAPI_LINUX_BLKDEV_H
+#define _UAPI_LINUX_BLKDEV_H
+#include <linux/ioctl.h>
+#include <linux/types.h>
+#define BLOCK_URING_CMD_DISCARD _IO(0x12, 0)
+#endif