1 files changed, 2 insertions, 1 deletions
diff --git a/library/std/src/sys/unix/args.rs b/library/std/src/sys/unix/args.rs
index ee5e3983ac2..79964e2b238 100644
--- a/library/std/src/sys/unix/args.rs
+++ b/library/std/src/sys/unix/args.rs
@@ -68,7 +68,8 @@ impl DoubleEndedIterator for Args {
     target_os = "l4re",
     target_os = "fuchsia",
     target_os = "redox",
-    target_os = "vxworks"
+    target_os = "vxworks",
+    target_os = "horizon"
 ))]
 mod imp {
     use super::Args;