diff --git a/src/uu/ls/src/ls.rs b/src/uu/ls/src/ls.rs
index 8fcd34bed..ef314dfa8 100644
--- a/src/uu/ls/src/ls.rs
+++ b/src/uu/ls/src/ls.rs
@@ -1590,7 +1590,7 @@ fn display_uname(metadata: &Metadata, config: &Config) -> String {
     }
 }
 
-#[cfg(unix)]
+#[cfg(all(unix, not(target_os = "redox")))]
 fn cached_gid2grp(gid: u32) -> String {
     lazy_static! {
         static ref GID_CACHE: Mutex<HashMap<u32, String>> = Mutex::new(HashMap::new());
@@ -1603,7 +1603,7 @@ fn cached_gid2grp(gid: u32) -> String {
         .clone()
 }
 
-#[cfg(unix)]
+#[cfg(all(unix, not(target_os = "redox")))]
 fn display_group(metadata: &Metadata, config: &Config) -> String {
     if config.long.numeric_uid_gid {
         metadata.gid().to_string()
@@ -1612,6 +1612,11 @@ fn display_group(metadata: &Metadata, config: &Config) -> String {
     }
 }
 
+#[cfg(target_os = "redox")]
+fn display_group(metadata: &Metadata, config: &Config) -> String {
+    metadata.gid().to_string()
+}
+
 #[cfg(not(unix))]
 fn display_uname(_metadata: &Metadata, _config: &Config) -> String {
     "somebody".to_string()