diff --git a/src/unix/newlib/mod.rs b/src/unix/newlib/mod.rs
index 1929bb795f4f709f959515be181b83dcc2d5d4ae..ba25d3cea1dc3cb7836645a10c1ac8565efabfb0 100644
--- a/src/unix/newlib/mod.rs
+++ b/src/unix/newlib/mod.rs
@@ -590,6 +590,7 @@ extern {
                        host: *mut ::c_char, hostlen: socklen_t,
                        serv: *mut ::c_char, servlen: socklen_t,
                        flags: ::c_int) -> ::c_int;
+    pub fn memalign(align: ::size_t, size: ::size_t) -> *mut ::c_void;
 }
 
 cfg_if! {