diff --git a/include/sys/uio.h b/include/sys/uio.h
index 09b6ab9e007a8d895e840eccd058ee4c2934bc5e..00f73a2f0525b62d8298c36d6904c54bf6ffb9ff 100644
--- a/include/sys/uio.h
+++ b/include/sys/uio.h
@@ -21,6 +21,8 @@ extern "C" {
 
 #include <bits/alltypes.h>
 
+#define UIO_MAXIOV 1024
+
 ssize_t readv (int, const struct iovec *, int);
 ssize_t writev (int, const struct iovec *, int);