diff --git a/library/std/src/sync/nonpoison/mutex.rs b/library/std/src/sync/nonpoison/mutex.rs
index f8af081e79d9..07430ce3a139 100644
--- a/library/std/src/sync/nonpoison/mutex.rs
+++ b/library/std/src/sync/nonpoison/mutex.rs
@@ -457,7 +457,8 @@ impl<T: ?Sized + fmt::Display> fmt::Display for MutexGuard<'_, T> {
     }
 }
 
-pub fn guard_lock<'a, T: ?Sized>(guard: &MutexGuard<'a, T>) -> &'a sys::Mutex {
+/// For use in [`nonpoison::condvar`](super::condvar).
+pub(super) fn guard_lock<'a, T: ?Sized>(guard: &MutexGuard<'a, T>) -> &'a sys::Mutex {
     &guard.lock.inner
 }
 
diff --git a/library/std/src/sync/poison/mutex.rs b/library/std/src/sync/poison/mutex.rs
index 720c212c65cf..7e9d920d92f8 100644
--- a/library/std/src/sync/poison/mutex.rs
+++ b/library/std/src/sync/poison/mutex.rs
@@ -757,11 +757,13 @@ impl<T: ?Sized + fmt::Display> fmt::Display for MutexGuard<'_, T> {
     }
 }
 
-pub fn guard_lock<'a, T: ?Sized>(guard: &MutexGuard<'a, T>) -> &'a sys::Mutex {
+/// For use in [`nonpoison::condvar`](super::condvar).
+pub(super) fn guard_lock<'a, T: ?Sized>(guard: &MutexGuard<'a, T>) -> &'a sys::Mutex {
     &guard.lock.inner
 }
 
-pub fn guard_poison<'a, T: ?Sized>(guard: &MutexGuard<'a, T>) -> &'a poison::Flag {
+/// For use in [`nonpoison::condvar`](super::condvar).
+pub(super) fn guard_poison<'a, T: ?Sized>(guard: &MutexGuard<'a, T>) -> &'a poison::Flag {
     &guard.lock.poison
 }