diff --git a/crates/polars-ops/src/frame/join/hash_join/single_keys_outer.rs b/crates/polars-ops/src/frame/join/hash_join/single_keys_outer.rs
index f2e0f21ad8f7..6267a5e41a4c 100644
--- a/crates/polars-ops/src/frame/join/hash_join/single_keys_outer.rs
+++ b/crates/polars-ops/src/frame/join/hash_join/single_keys_outer.rs
@@ -25,7 +25,7 @@ where
             .map(|iter| {
                 // create hashes and keys
                 iter.into_iter()
-                    .map(|val| (build_hasher.hash_one(&val.to_total_ord()), val))
+                    .map(|val| (build_hasher.hash_one(val.to_total_ord()), val))
                     .collect_trusted::<Vec<_>>()
             })
             .collect()