diff --git a/compiler/rustc_data_structures/src/flock.rs b/compiler/rustc_data_structures/src/flock.rs
index 008565e4c7b97..e03962a54ecab 100644
--- a/compiler/rustc_data_structures/src/flock.rs
+++ b/compiler/rustc_data_structures/src/flock.rs
@@ -9,6 +9,10 @@ cfg_match! {
         mod linux;
         use linux as imp;
     }
+    cfg(target_os = "redox") => {
+        mod linux;
+        use linux as imp;
+    }
     cfg(unix) => {
         mod unix;
         use unix as imp;