diff --git a/src/main.rs b/src/main.rs
index 6be02e6..ac9d847 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -37,7 +37,7 @@ fn main() -> ! {
     static mut HEAP: [u8; HEAP_SIZE] = [0; HEAP_SIZE];
     #[global_allocator]
     static ALLOCATOR: embedded_alloc::Heap = embedded_alloc::Heap::empty();
-    unsafe { ALLOCATOR.init(&mut HEAP as *const u8 as usize, core::mem::size_of_val(&HEAP)) };
+    unsafe { ALLOCATOR.init(core::ptr::addr_of_mut!(HEAP) as usize, HEAP_SIZE) }
 
     // -------- Setup peripherials --------
     let mut pac = pac::Peripherals::take().unwrap();