diff --git a/libc/include/sys/uio.h b/libc/include/sys/uio.h
index b166277..37961e3 100644
--- a/libc/include/sys/uio.h
+++ b/libc/include/sys/uio.h
@@ -25,6 +25,7 @@
  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  */
+
 #ifndef _SYS_UIO_H_
 #define _SYS_UIO_H_
 
@@ -34,23 +35,21 @@
 
 __BEGIN_DECLS
 
-ssize_t readv(int, const struct iovec*, int);
-ssize_t writev(int, const struct iovec*, int);
+ssize_t readv(int __fd, const struct iovec* __iov, int __count);
+ssize_t writev(int __fd, const struct iovec* __iov, int __count);
 
 #if defined(__USE_GNU)
-ssize_t preadv(int, const struct iovec*, int, off_t) __RENAME_IF_FILE_OFFSET64(preadv64) __INTRODUCED_IN(24);
-ssize_t pwritev(int, const struct iovec*, int, off_t) __RENAME_IF_FILE_OFFSET64(pwritev64) __INTRODUCED_IN(24);
-ssize_t preadv64(int, const struct iovec*, int, off64_t) __INTRODUCED_IN(24);
-ssize_t pwritev64(int, const struct iovec*, int, off64_t) __INTRODUCED_IN(24);
+ssize_t preadv(int __fd, const struct iovec* __iov, int __count, off_t __offset) __RENAME_IF_FILE_OFFSET64(preadv64) __INTRODUCED_IN(24);
+ssize_t pwritev(int __fd, const struct iovec* __iov, int __count, off_t __offset) __RENAME_IF_FILE_OFFSET64(pwritev64) __INTRODUCED_IN(24);
+ssize_t preadv64(int __fd, const struct iovec* __iov, int __count, off64_t __offset) __INTRODUCED_IN(24);
+ssize_t pwritev64(int __fd, const struct iovec* __iov, int __count, off64_t __offset) __INTRODUCED_IN(24);
 #endif
 
 #if defined(__USE_GNU)
-ssize_t process_vm_readv(pid_t, const struct iovec*, unsigned long, const struct iovec*,
-                         unsigned long, unsigned long) __INTRODUCED_IN(23);
-ssize_t process_vm_writev(pid_t, const struct iovec*, unsigned long, const struct iovec*,
-                          unsigned long, unsigned long) __INTRODUCED_IN(23);
+ssize_t process_vm_readv(pid_t __pid, const struct iovec* __local_iov, unsigned long __local_iov_count, const struct iovec* __remote_iov, unsigned long __remote_iov_count, unsigned long __flags) __INTRODUCED_IN(23);
+ssize_t process_vm_writev(pid_t __pid, const struct iovec* __local_iov, unsigned long __local_iov_count, const struct iovec* __remote_iov, unsigned long __remote_iov_count, unsigned long __flags) __INTRODUCED_IN(23);
 #endif
 
 __END_DECLS
 
-#endif /* _SYS_UIO_H_ */
+#endif