diff --git a/core/src/ascii/ascii_char.rs b/core/src/ascii/ascii_char.rs
index ce09a0b444da3..48de4f17b1b3a 100644
--- a/core/src/ascii/ascii_char.rs
+++ b/core/src/ascii/ascii_char.rs
@@ -506,7 +506,7 @@ impl AsciiChar {
     pub const unsafe fn digit_unchecked(d: u8) -> Self {
         assert_unsafe_precondition!(
             check_language_ub,
-            "`AsciiChar::digit_unchecked` input cannot exceed 9.",
+            "`ascii::Char::digit_unchecked` input cannot exceed 9.",
             (d: u8 = d) => d < 10
         );
 
diff --git a/core/src/ptr/mod.rs b/core/src/ptr/mod.rs
index 53ca5a7f198e0..62160937083c5 100644
--- a/core/src/ptr/mod.rs
+++ b/core/src/ptr/mod.rs
@@ -1432,7 +1432,8 @@ pub const unsafe fn read<T>(src: *const T) -> T {
             (
                 addr: *const () = src as *const (),
                 align: usize = align_of::<T>(),
-            ) => ub_checks::is_aligned_and_not_null(addr, align)
+                is_zst: bool = T::IS_ZST,
+            ) => ub_checks::is_aligned_and_not_null(addr, align, is_zst)
         );
         crate::intrinsics::read_via_copy(src)
     }
@@ -1637,7 +1638,8 @@ pub const unsafe fn write<T>(dst: *mut T, src: T) {
             (
                 addr: *mut () = dst as *mut (),
                 align: usize = align_of::<T>(),
-            ) => ub_checks::is_aligned_and_not_null(addr, align)
+                is_zst: bool = T::IS_ZST,
+            ) => ub_checks::is_aligned_and_not_null(addr, align, is_zst)
         );
         intrinsics::write_via_move(dst, src)
     }