diff --git a/src/raw.rs b/src/raw.rs
index bb031da..ec2a6ec 100644
--- a/src/raw.rs
+++ b/src/raw.rs
@@ -310,7 +310,7 @@ where
                         // If the task is not running, now is the time to schedule.
                         if state & RUNNING == 0 {
                             // If the reference count overflowed, abort.
-                            if state > isize::max_value() as usize {
+                            if state > isize::MAX as usize {
                                 abort();
                             }
 
@@ -340,7 +340,7 @@ where
         let state = (*raw.header).state.fetch_add(REFERENCE, Ordering::Relaxed);
 
         // If the reference count overflowed, abort.
-        if state > isize::max_value() as usize {
+        if state > isize::MAX as usize {
             abort();
         }
 
diff --git a/src/utils.rs b/src/utils.rs
index 189e9af..5c2170c 100644
--- a/src/utils.rs
+++ b/src/utils.rs
@@ -83,7 +83,7 @@ impl Layout {
 
     /// Returns the layout for `a` followed by `b` and the offset of `b`.
     ///
-    /// This function was adapted from the currently unstable `Layout::extend()`:
+    /// This function was adapted from the `Layout::extend()`:
     /// https://doc.rust-lang.org/nightly/std/alloc/struct.Layout.html#method.extend
     #[inline]
     pub(crate) const fn extend(self, other: Layout) -> Option<(Layout, usize)> {
@@ -97,7 +97,7 @@ impl Layout {
         // - align is 0 (implied false by is_power_of_two())
         // - align is not a power of 2
         // - size rounded up to align overflows
-        if !new_align.is_power_of_two() || new_size > core::usize::MAX - (new_align - 1) {
+        if !new_align.is_power_of_two() || new_size > isize::MAX as usize - (new_align - 1) {
             return None;
         }
 
@@ -107,7 +107,7 @@ impl Layout {
 
     /// Returns the padding after `layout` that aligns the following address to `align`.
     ///
-    /// This function was adapted from the currently unstable `Layout::padding_needed_for()`:
+    /// This function was adapted from the `Layout::padding_needed_for()`:
     /// https://doc.rust-lang.org/nightly/std/alloc/struct.Layout.html#method.padding_needed_for
     #[inline]
     pub(crate) const fn padding_needed_for(self, align: usize) -> usize {