diff --git a/library/core/src/hash/mod.rs b/library/core/src/hash/mod.rs
index 9dbefe0822e36..8dec643255f64 100644
--- a/library/core/src/hash/mod.rs
+++ b/library/core/src/hash/mod.rs
@@ -520,7 +520,10 @@ pub trait BuildHasher {
     /// );
     /// ```
     #[unstable(feature = "build_hasher_simple_hash_one", issue = "86161")]
-    fn hash_one<T: Hash>(&self, x: T) -> u64 {
+    fn hash_one<T: Hash>(&self, x: T) -> u64
+    where
+        Self: Sized,
+    {
         let mut hasher = self.build_hasher();
         x.hash(&mut hasher);
         hasher.finish()
diff --git a/src/test/ui/build-hasher-object-safe.rs b/src/test/ui/build-hasher-object-safe.rs
new file mode 100644
index 0000000000000..50ec8e5e8d96e
--- /dev/null
+++ b/src/test/ui/build-hasher-object-safe.rs
@@ -0,0 +1,10 @@
+// run-pass
+
+use std::hash::BuildHasher;
+use std::collections::hash_map::{DefaultHasher, RandomState};
+
+fn ensure_object_safe(_: &dyn BuildHasher<Hasher = DefaultHasher>) {}
+
+fn main() {
+    ensure_object_safe(&RandomState::new());
+}