diff --git a/src/external_trait_impls/serde.rs b/src/external_trait_impls/serde.rs
index 0a76dbec2..f9eb05fd7 100644
--- a/src/external_trait_impls/serde.rs
+++ b/src/external_trait_impls/serde.rs
@@ -186,7 +186,7 @@ mod set {
             where
                 A: Allocator;
 
-            impl<'a, 'de, T, S, A> Visitor<'de> for SeqInPlaceVisitor<'a, T, S, A>
+            impl<'de, T, S, A> Visitor<'de> for SeqInPlaceVisitor<'_, T, S, A>
             where
                 T: Deserialize<'de> + Eq + Hash,
                 S: BuildHasher + Default,
diff --git a/src/map.rs b/src/map.rs
index c373d5958..7c19a4c57 100644
--- a/src/map.rs
+++ b/src/map.rs
@@ -4,7 +4,7 @@ use crate::raw::{
 use crate::{DefaultHashBuilder, Equivalent, TryReserveError};
 use core::borrow::Borrow;
 use core::fmt::{self, Debug};
-use core::hash::{BuildHasher, Hash};
+use core::hash::{BuildHasher, Hash, Hasher};
 use core::iter::FusedIterator;
 use core::marker::PhantomData;
 use core::mem;
@@ -255,7 +255,10 @@ where
     Q: Hash + ?Sized,
     S: BuildHasher,
 {
-    hash_builder.hash_one(val)
+    // FIXME: use `hash_one` when MSRV >= 1.71.0
+    let mut hasher = hash_builder.build_hasher();
+    val.hash(&mut hasher);
+    hasher.finish()
 }
 
 #[cfg(feature = "default-hasher")]