diff --git a/blog/content/second-edition/posts/10-heap-allocation/index.md b/blog/content/second-edition/posts/10-heap-allocation/index.md
index cfebc7ae..924642eb 100644
--- a/blog/content/second-edition/posts/10-heap-allocation/index.md
+++ b/blog/content/second-edition/posts/10-heap-allocation/index.md
@@ -678,9 +678,11 @@ The implementation of the `main` function looks like this:
 fn main(boot_info: &'static BootInfo) -> ! {
     use blog_os::allocator;
     use blog_os::memory::{self, BootInfoFrameAllocator};
+    use x86_64::VirtAddr;
 
     blog_os::init();
-    let mut mapper = unsafe { memory::init(boot_info.physical_memory_offset) };
+    let phys_mem_offset = VirtAddr::new(boot_info.physical_memory_offset);
+    let mut mapper = unsafe { memory::init(phys_mem_offset) };
     let mut frame_allocator = unsafe {
         BootInfoFrameAllocator::init(&boot_info.memory_map)
     };