diff --git a/src/unix/mod.rs b/src/unix/mod.rs
index 9b39050e6cc17..11e4375f062c0 100644
--- a/src/unix/mod.rs
+++ b/src/unix/mod.rs
@@ -328,6 +328,10 @@ extern {
     #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                link_name = "fdopen$UNIX2003")]
     pub fn fdopen(fd: ::c_int, mode: *const c_char) -> *mut ::FILE;
+
+    #[cfg(not(any(target_os = "macos", target_os = "ios")))]
+    pub fn fdopendir(fd: ::c_int) -> *mut ::DIR;
+
     pub fn fileno(stream: *mut ::FILE) -> ::c_int;
 
     #[cfg_attr(all(target_os = "macos", target_arch = "x86"),