diff --git a/libc/kernel/uapi/linux/ntsync.h b/libc/kernel/uapi/linux/ntsync.h
new file mode 100644
index 0000000..857b31b
--- /dev/null
+++ b/libc/kernel/uapi/linux/ntsync.h
@@ -0,0 +1,17 @@
+/*
+ * This file is auto-generated. Modifications will be lost.
+ *
+ * See https://android.googlesource.com/platform/bionic/+/master/libc/kernel/
+ * for more information.
+ */
+#ifndef __LINUX_NTSYNC_H
+#define __LINUX_NTSYNC_H
+#include <linux/types.h>
+struct ntsync_sem_args {
+  __u32 sem;
+  __u32 count;
+  __u32 max;
+};
+#define NTSYNC_IOC_CREATE_SEM _IOWR('N', 0x80, struct ntsync_sem_args)
+#define NTSYNC_IOC_SEM_POST _IOWR('N', 0x81, __u32)
+#endif