diff --git a/include/sys/uio.h b/include/sys/uio.h
index d4dba19a3..0d4303f07 100644
--- a/include/sys/uio.h
+++ b/include/sys/uio.h
@@ -15,9 +15,11 @@ struct iovec
 	size_t	iov_len;
 };
 
+#if 0
 _PROTOTYPE(ssize_t readv, (int _fildes, const struct iovec *_iov,
 							int _iovcnt)	);
 _PROTOTYPE(ssize_t writev, (int _fildes, const struct iovec *_iov,
 							int iovcnt)	);
+#endif
 
 #endif /* _SYS_UIO_H */