diff --git a/library/alloc/benches/lib.rs b/library/alloc/benches/lib.rs
index d418965cd2f6..b25d63d835b5 100644
--- a/library/alloc/benches/lib.rs
+++ b/library/alloc/benches/lib.rs
@@ -5,7 +5,9 @@
 #![feature(iter_next_chunk)]
 #![feature(repr_simd)]
 #![feature(slice_partition_dedup)]
+#![feature(strict_provenance)]
 #![feature(test)]
+#![deny(fuzzy_provenance_casts)]
 
 extern crate test;
 
diff --git a/library/alloc/src/lib.rs b/library/alloc/src/lib.rs
index 008926666c13..a9f2873faf97 100644
--- a/library/alloc/src/lib.rs
+++ b/library/alloc/src/lib.rs
@@ -82,6 +82,7 @@
 //
 // Lints:
 #![deny(unsafe_op_in_unsafe_fn)]
+#![deny(fuzzy_provenance_casts)]
 #![warn(deprecated_in_future)]
 #![warn(missing_debug_implementations)]
 #![warn(missing_docs)]
diff --git a/library/alloc/tests/fmt.rs b/library/alloc/tests/fmt.rs
index 5ee6db43fda2..04da95bbb83e 100644
--- a/library/alloc/tests/fmt.rs
+++ b/library/alloc/tests/fmt.rs
@@ -2,6 +2,7 @@
 
 use std::cell::RefCell;
 use std::fmt::{self, Write};
+use std::ptr;
 
 #[test]
 fn test_format() {
@@ -76,14 +77,14 @@ fn test_format_macro_interface() {
     t!(format!("{}", "foo"), "foo");
     t!(format!("{}", "foo".to_string()), "foo");
     if cfg!(target_pointer_width = "32") {
-        t!(format!("{:#p}", 0x1234 as *const isize), "0x00001234");
-        t!(format!("{:#p}", 0x1234 as *mut isize), "0x00001234");
+        t!(format!("{:#p}", ptr::invalid::<isize>(0x1234)), "0x00001234");
+        t!(format!("{:#p}", ptr::invalid_mut::<isize>(0x1234)), "0x00001234");
     } else {
-        t!(format!("{:#p}", 0x1234 as *const isize), "0x0000000000001234");
-        t!(format!("{:#p}", 0x1234 as *mut isize), "0x0000000000001234");
+        t!(format!("{:#p}", ptr::invalid::<isize>(0x1234)), "0x0000000000001234");
+        t!(format!("{:#p}", ptr::invalid_mut::<isize>(0x1234)), "0x0000000000001234");
     }
-    t!(format!("{:p}", 0x1234 as *const isize), "0x1234");
-    t!(format!("{:p}", 0x1234 as *mut isize), "0x1234");
+    t!(format!("{:p}", ptr::invalid::<isize>(0x1234)), "0x1234");
+    t!(format!("{:p}", ptr::invalid_mut::<isize>(0x1234)), "0x1234");
     t!(format!("{A:x}"), "aloha");
     t!(format!("{B:X}"), "adios");
     t!(format!("foo {} ☃☃☃☃☃☃", "bar"), "foo bar ☃☃☃☃☃☃");
diff --git a/library/alloc/tests/lib.rs b/library/alloc/tests/lib.rs
index ffc5ca7a5c6c..d066ec03ee57 100644
--- a/library/alloc/tests/lib.rs
+++ b/library/alloc/tests/lib.rs
@@ -47,6 +47,7 @@
 #![feature(strict_provenance)]
 #![feature(once_cell)]
 #![feature(drain_keep_rest)]
+#![deny(fuzzy_provenance_casts)]
 
 use std::collections::hash_map::DefaultHasher;
 use std::hash::{Hash, Hasher};