diff --git a/crate/bcm2837/src/asm.rs b/crate/bcm2837/src/asm.rs
index 72f4c73..1c2b449 100644
--- a/crate/bcm2837/src/asm.rs
+++ b/crate/bcm2837/src/asm.rs
@@ -4,7 +4,7 @@
 #[inline]
 pub unsafe fn delay(clock: u32) {
     #[cfg(target_arch = "aarch64")]
-    asm!("1: subs x0, x0, #1; bne 1b;"
+    asm!("mov x1, x0; 1: subs x1, x1, #1; bne 1b;"
         :: "{x0}"(clock)
         :: "volatile");
 }