diff --git a/kernel/src/allocator.rs b/kernel/src/allocator.rs
index 4c73d1c..50fb329 100644
--- a/kernel/src/allocator.rs
+++ b/kernel/src/allocator.rs
@@ -148,7 +148,7 @@ impl Heap {
             aligned_first_chunk + chunks_needed <= first_chunk + chunks_needed + chunk_alignment
         );
 
-        let header = add as *mut Header;
+        let header = addr as *mut Header;
         unsafe {
             (*header).size_in_chunks = chunks_needed;
         }