diff --git a/src/liballoc/raw_vec.rs b/src/liballoc/raw_vec.rs
index 7ac67870eb751..0780b33e53ae6 100644
--- a/src/liballoc/raw_vec.rs
+++ b/src/liballoc/raw_vec.rs
@@ -608,7 +608,7 @@ unsafe impl<#[may_dangle] T, A: AllocRef> Drop for RawVec<T, A> {
 
 #[inline]
 fn alloc_guard(alloc_size: usize) -> Result<(), TryReserveError> {
-    if mem::size_of::<usize>() < 8 && alloc_size > core::isize::MAX as usize {
+    if mem::size_of::<usize>() < 8 && alloc_size > isize::MAX as usize {
         Err(CapacityOverflow)
     } else {
         Ok(())
diff --git a/src/liballoc/tests/btree/map.rs b/src/liballoc/tests/btree/map.rs
index 14f12ca2d779a..96b6c32a1fa8e 100644
--- a/src/liballoc/tests/btree/map.rs
+++ b/src/liballoc/tests/btree/map.rs
@@ -475,7 +475,7 @@ fn test_range_large() {
 
 #[test]
 fn test_range_inclusive_max_value() {
-    let max = std::usize::MAX;
+    let max = usize::MAX;
     let map: BTreeMap<_, _> = vec![(max, 0)].into_iter().collect();
 
     assert_eq!(map.range(max..=max).collect::<Vec<_>>(), &[(&max, &0)]);