diff --git a/src/unix/mod.rs b/src/unix/mod.rs
index cf7cbd9718851..e1ad78fb96175 100644
--- a/src/unix/mod.rs
+++ b/src/unix/mod.rs
@@ -299,7 +299,6 @@ cfg_if! {
     } else if #[cfg(feature = "std")] {
         // cargo build, don't pull in anything extra as the libstd dep
         // already pulls in all libs.
-        extern {}
     } else if #[cfg(all(target_os = "linux",
                         target_env = "gnu",
                         feature = "rustc-dep-of-std"))] {