diff --git a/kernel/src/memory/Heap.cpp b/kernel/src/memory/Heap.cpp
index 5887e7dc..dc172a83 100644
--- a/kernel/src/memory/Heap.cpp
+++ b/kernel/src/memory/Heap.cpp
@@ -176,7 +176,7 @@ Result<void*> kmalloc(usize size)
 
     if (!heap_start)
     {
-        const usize pages = get_pages_for_allocation(size);
+        const usize pages = get_pages_for_allocation(size + sizeof(HeapBlock));
         HeapBlock* const block = TRY(allocate_pages(pages));
 
         block->full_size = (pages * ARCH_PAGE_SIZE) - sizeof(HeapBlock);
@@ -214,7 +214,7 @@ Result<void*> kmalloc(usize size)
 
     if (!block) // No free blocks, let's allocate a new one
     {
-        usize pages = get_pages_for_allocation(size);
+        usize pages = get_pages_for_allocation(size + sizeof(HeapBlock));
         block = TRY(allocate_pages(pages));
 
         block->full_size = (pages * ARCH_PAGE_SIZE) - sizeof(HeapBlock);