diff --git a/src/bin/bios.rs b/src/bin/bios.rs
index 557f71d1..c39c45f2 100644
--- a/src/bin/bios.rs
+++ b/src/bin/bios.rs
@@ -51,8 +51,8 @@ extern "C" {
 pub unsafe extern "C" fn stage_4() -> ! {
     // Set stack segment
     asm!(
-        "mov bx, 0x0; mov ss, bx",
-        out("bx") _,
+        "mov ax, 0x0; mov ss, ax",
+        out("ax") _,
     );
 
     let kernel_start = 0x400000;