diff --git a/library/alloc/tests/lib.rs b/library/alloc/tests/lib.rs
index dd98f806451..d40496bfaab 100644
--- a/library/alloc/tests/lib.rs
+++ b/library/alloc/tests/lib.rs
@@ -21,6 +21,7 @@
 #![feature(vecdeque_binary_search)]
 #![feature(slice_group_by)]
 #![feature(vec_extend_from_within)]
+#![feature(vec_spare_capacity)]
 
 use std::collections::hash_map::DefaultHasher;
 use std::hash::{Hash, Hasher};
diff --git a/library/alloc/tests/vec.rs b/library/alloc/tests/vec.rs
index 2969da58d42..fab45028585 100644
--- a/library/alloc/tests/vec.rs
+++ b/library/alloc/tests/vec.rs
@@ -1691,6 +1691,10 @@ fn next_then_drop<I: Iterator>(mut i: I) {
     next_then_drop(v.splice(5..6, vec![1; 10].into_iter().filter(|_| true))); // lower bound not exact
     assert_eq!(*v0, 13);
 
+    // spare_capacity_mut
+    v.spare_capacity_mut();
+    assert_eq!(*v0, 13);
+
     // Smoke test that would fire even outside Miri if an actual relocation happened.
     *v0 -= 13;
     assert_eq!(v[0], 0);