diff --git a/asm/inline.rs b/asm/inline.rs
index 5e2fbc10..ef203cd5 100644
--- a/asm/inline.rs
+++ b/asm/inline.rs
@@ -61,7 +61,7 @@ pub unsafe fn __delay(cyc: u32) {
         "1:",
         "subs {}, #1",
         "bne 1b",
-        in(reg) real_cyc
+        inout(reg) real_cyc => _
     );
 }
 
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