diff --git a/objc2-foundation/src/attributed_string.rs b/objc2-foundation/src/attributed_string.rs
index f5dd4d9bb..1417f5805 100644
--- a/objc2-foundation/src/attributed_string.rs
+++ b/objc2-foundation/src/attributed_string.rs
@@ -157,7 +157,10 @@ mod tests {
         assert!(s2.is_kind_of(NSAttributedString::class()));
 
         let s3 = s1.mutable_copy();
-        assert_ne!(Id::as_ptr(&s1), Id::as_ptr(&s3) as *mut NSAttributedString);
+        assert_ne!(
+            Id::as_ptr(&s1),
+            Id::as_ptr(&s3) as *const NSAttributedString
+        );
         assert!(s3.is_kind_of(NSMutableAttributedString::class()));
     }
 }
diff --git a/objc2-foundation/src/mutable_attributed_string.rs b/objc2-foundation/src/mutable_attributed_string.rs
index 8d407115a..77100dee9 100644
--- a/objc2-foundation/src/mutable_attributed_string.rs
+++ b/objc2-foundation/src/mutable_attributed_string.rs
@@ -90,7 +90,10 @@ mod tests {
     fn test_copy() {
         let s1 = NSMutableAttributedString::from_nsstring(&NSString::from_str("abc"));
         let s2 = s1.copy();
-        assert_ne!(Id::as_ptr(&s1) as *mut NSAttributedString, Id::as_ptr(&s2));
+        assert_ne!(
+            Id::as_ptr(&s1) as *const NSAttributedString,
+            Id::as_ptr(&s2)
+        );
         assert!(s2.is_kind_of(NSAttributedString::class()));
 
         let s3 = s1.mutable_copy();
diff --git a/objc2-foundation/src/mutable_string.rs b/objc2-foundation/src/mutable_string.rs
index 46a7973ea..d12e49eb6 100644
--- a/objc2-foundation/src/mutable_string.rs
+++ b/objc2-foundation/src/mutable_string.rs
@@ -200,7 +200,7 @@ mod tests {
     fn test_copy() {
         let s1 = NSMutableString::from_str("abc");
         let s2 = s1.copy();
-        assert_ne!(Id::as_ptr(&s1), Id::as_ptr(&s2) as *mut NSMutableString);
+        assert_ne!(Id::as_ptr(&s1), Id::as_ptr(&s2) as *const NSMutableString);
         assert!(s2.is_kind_of(NSString::class()));
 
         let s3 = s1.mutable_copy();
diff --git a/objc2-foundation/src/string.rs b/objc2-foundation/src/string.rs
index e9459c67c..7c5660a46 100644
--- a/objc2-foundation/src/string.rs
+++ b/objc2-foundation/src/string.rs
@@ -350,7 +350,7 @@ mod tests {
         assert!(s2.is_kind_of(NSString::class()));
 
         let s3 = s1.mutable_copy();
-        assert_ne!(Id::as_ptr(&s1), Id::as_ptr(&s3) as *mut NSString);
+        assert_ne!(Id::as_ptr(&s1), Id::as_ptr(&s3) as *const NSString);
         assert!(s3.is_kind_of(NSMutableString::class()));
     }
 
diff --git a/objc2/CHANGELOG.md b/objc2/CHANGELOG.md
index fb9317ee5..48284152f 100644
--- a/objc2/CHANGELOG.md
+++ b/objc2/CHANGELOG.md
@@ -11,7 +11,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
   upgrading easier.
 * Allow using `From`/`TryFrom` to convert between `rc::Id` and `rc::WeakId`.
 * Added `Bool::as_bool` (more descriptive name than `Bool::is_true`).
-* Added convenience method `Id::as_ptr`.
+* Added convenience method `Id::as_ptr` and `Id::as_mut_ptr`.
 * The `objc2-encode` dependency is now exposed as `objc2::encode`.
 * Added `Id::retain_autoreleased` to allow following Cocoas memory management
   rules more efficiently.
diff --git a/objc2/benches/autorelease.rs b/objc2/benches/autorelease.rs
index 5e0ae9ef3..7bb047d16 100644
--- a/objc2/benches/autorelease.rs
+++ b/objc2/benches/autorelease.rs
@@ -61,11 +61,11 @@ fn new_nsdata() -> Id<Object, Shared> {
     unsafe { Id::new(obj).unwrap_unchecked() }
 }
 
-fn new_leaked_nsdata() -> *mut Object {
+fn new_leaked_nsdata() -> *const Object {
     Id::as_ptr(&*ManuallyDrop::new(new_nsdata()))
 }
 
-fn autoreleased_nsdata() -> *mut Object {
+fn autoreleased_nsdata() -> *const Object {
     // let bytes_ptr = BYTES.as_ptr() as *const c_void;
     // unsafe {
     //     msg_send![
@@ -83,20 +83,20 @@ fn new_nsstring() -> Id<Object, Shared> {
     unsafe { Id::new(obj).unwrap_unchecked() }
 }
 
-fn new_leaked_nsstring() -> *mut Object {
+fn new_leaked_nsstring() -> *const Object {
     Id::as_ptr(&*ManuallyDrop::new(new_nsstring()))
 }
 
-fn autoreleased_nsstring() -> *mut Object {
+fn autoreleased_nsstring() -> *const Object {
     // unsafe { msg_send![class!(NSString), string] }
     unsafe { msg_send![new_leaked_nsstring(), autorelease] }
 }
 
-fn retain_autoreleased(obj: *mut Object) -> Id<Object, Shared> {
-    unsafe { Id::retain_autoreleased(obj.cast()).unwrap_unchecked() }
+fn retain_autoreleased(obj: *const Object) -> Id<Object, Shared> {
+    unsafe { Id::retain_autoreleased((obj as *mut Object).cast()).unwrap_unchecked() }
 }
 
-fn autoreleased_nsdata_pool_cleanup() -> *mut Object {
+fn autoreleased_nsdata_pool_cleanup() -> *const Object {
     autoreleasepool(|_| autoreleased_nsdata())
 }
 
@@ -108,7 +108,7 @@ fn autoreleased_nsdata_fast_caller_cleanup_pool_cleanup() -> Id<Object, Shared>
     autoreleasepool(|_| retain_autoreleased(autoreleased_nsdata()))
 }
 
-fn autoreleased_nsstring_pool_cleanup() -> *mut Object {
+fn autoreleased_nsstring_pool_cleanup() -> *const Object {
     autoreleasepool(|_| autoreleased_nsstring())
 }
 
diff --git a/objc2/src/message/mod.rs b/objc2/src/message/mod.rs
index 6a6a073e0..3ea1c390d 100644
--- a/objc2/src/message/mod.rs
+++ b/objc2/src/message/mod.rs
@@ -263,7 +263,7 @@ unsafe impl<'a, T: Message + ?Sized, O: Ownership> MessageReceiver for &'a Id<T,
 unsafe impl<'a, T: Message + ?Sized> MessageReceiver for &'a mut Id<T, Owned> {
     #[inline]
     fn as_raw_receiver(self) -> *mut Object {
-        Id::as_ptr(self) as *mut Object
+        Id::as_mut_ptr(self) as *mut Object
     }
 }
 
@@ -277,7 +277,7 @@ unsafe impl<'a, T: Message + ?Sized, O: Ownership> MessageReceiver for &'a Manua
 unsafe impl<'a, T: Message + ?Sized> MessageReceiver for &'a mut ManuallyDrop<Id<T, Owned>> {
     #[inline]
     fn as_raw_receiver(self) -> *mut Object {
-        Id::as_ptr(&mut **self) as *mut Object
+        Id::as_mut_ptr(&mut **self) as *mut Object
     }
 }
 
diff --git a/objc2/src/rc/id.rs b/objc2/src/rc/id.rs
index 397b517b5..dbf3bb7ad 100644
--- a/objc2/src/rc/id.rs
+++ b/objc2/src/rc/id.rs
@@ -192,9 +192,26 @@ impl<T: Message + ?Sized, O: Ownership> Id<T, O> {
     ///
     /// The pointer is valid for at least as long as the `Id` is held.
     ///
+    /// See [`Id::as_mut_ptr`] for the mutable equivalent.
+    ///
     /// This is an associated method, and must be called as `Id::as_ptr(obj)`.
     #[inline]
-    pub fn as_ptr(this: &Id<T, O>) -> *mut T {
+    pub fn as_ptr(this: &Id<T, O>) -> *const T {
+        this.ptr.as_ptr()
+    }
+}
+
+impl<T: Message + ?Sized> Id<T, Owned> {
+    /// Returns a raw mutable pointer to the object.
+    ///
+    /// The pointer is valid for at least as long as the `Id` is held.
+    ///
+    /// See [`Id::as_ptr`] for the immutable equivalent.
+    ///
+    /// This is an associated method, and must be called as
+    /// `Id::as_mut_ptr(obj)`.
+    #[inline]
+    pub fn as_mut_ptr(this: &mut Id<T, Owned>) -> *mut T {
         this.ptr.as_ptr()
     }
 }
diff --git a/objc2/src/rc/weak_id.rs b/objc2/src/rc/weak_id.rs
index 973b9cd69..c5332dd6a 100644
--- a/objc2/src/rc/weak_id.rs
+++ b/objc2/src/rc/weak_id.rs
@@ -49,10 +49,10 @@ impl<T: Message> WeakId<T> {
     /// # Safety
     ///
     /// The object must be valid or null.
-    unsafe fn new_inner(obj: *mut T) -> Self {
+    unsafe fn new_inner(obj: *const T) -> Self {
         let inner = Box::new(UnsafeCell::new(ptr::null_mut()));
         // SAFETY: `ptr` will never move, and the caller verifies `obj`
-        let _ = unsafe { ffi::objc_initWeak(inner.get(), obj as *mut ffi::objc_object) };
+        let _ = unsafe { ffi::objc_initWeak(inner.get(), obj as *mut T as *mut ffi::objc_object) };
         Self {
             inner,
             item: PhantomData,
@@ -108,7 +108,7 @@ impl<T: Message> Default for WeakId<T> {
     #[inline]
     fn default() -> Self {
         // SAFETY: The pointer is null
-        unsafe { Self::new_inner(ptr::null_mut()) }
+        unsafe { Self::new_inner(ptr::null()) }
     }
 }
 
diff --git a/tests/src/test_object.rs b/tests/src/test_object.rs
index 4e9c598a6..46d9d4a1d 100644
--- a/tests/src/test_object.rs
+++ b/tests/src/test_object.rs
@@ -179,12 +179,12 @@ fn test_object() {
     assert!(obj.var3().is_null());
     assert!(obj.var3_ivar().is_null());
 
-    let obj2 = Id::as_ptr(&mut *ManuallyDrop::new(NSObject::new())).cast::<Object>();
+    let obj2 = Id::as_mut_ptr(&mut *ManuallyDrop::new(NSObject::new())).cast::<Object>();
     obj.set_var3(obj2);
     assert_eq!(obj.var3(), obj2);
     assert_eq!(*obj.var3_ivar(), obj2);
 
-    let obj3 = Id::as_ptr(&mut *ManuallyDrop::new(NSObject::new())).cast::<Object>();
+    let obj3 = Id::as_mut_ptr(&mut *ManuallyDrop::new(NSObject::new())).cast::<Object>();
     *obj.var3_ivar_mut() = obj3;
     assert_ne!(obj.var3(), obj2);
     assert_ne!(*obj.var3_ivar(), obj2);