diff --git a/libc/include/sys/types.h b/libc/include/sys/types.h
index 14624ff1..87a0d591 100644
--- a/libc/include/sys/types.h
+++ b/libc/include/sys/types.h
@@ -1,5 +1,6 @@
 #pragma once
 
+#include <stddef.h>
 #include <stdint.h>
 #include <sys/cdefs.h>
 
@@ -7,15 +8,19 @@ __BEGIN_DECLS
 
 typedef int32_t		blkcnt_t;
 typedef int32_t		blksize_t;
+typedef uint64_t	clock_t;
+typedef int32_t		clockid_t;
 typedef uint64_t	dev_t;
 typedef uint32_t	ino_t;
 typedef uint16_t	mode_t;
 typedef uint32_t	nlink_t;
 typedef int64_t		off_t;
 typedef uint64_t	time_t;
+typedef uint64_t	timer_t;
 typedef int32_t		id_t;
 typedef id_t		pid_t;
 typedef id_t		uid_t;
 typedef id_t		gid_t;
+typedef int64_t		ssize_t;
 
 __END_DECLS
\ No newline at end of file