diff --git a/src/arena.rs b/src/arena.rs
index 1b5cd3e5..ffb92fb7 100644
--- a/src/arena.rs
+++ b/src/arena.rs
@@ -283,7 +283,10 @@ pub trait ArenaAllocated {
         Self::Payload: Sized,
     {
         TypedArenaPtr(NonNull::new_unchecked(
-            ptr.payload_offset().cast_mut().cast::<Self::Payload>(),
+            ptr.get_ptr()
+                .byte_add(Self::header_offset_from_payload())
+                .cast_mut()
+                .cast::<Self::Payload>(),
         ))
     }
 
diff --git a/src/types.rs b/src/types.rs
index 994a6a27..bcf67a4a 100644
--- a/src/types.rs
+++ b/src/types.rs
@@ -754,11 +754,6 @@ impl UntypedArenaPtr {
         }
     }
 
-    #[inline]
-    pub fn payload_offset(self) -> *const u8 {
-        unsafe { self.get_ptr().byte_add(size_of::<ArenaHeader>()).cast() }
-    }
-
     /// # Safety
     /// - this UntypedArenaPtr actual pointee type is T
     /// - the pointer must be non-null