diff --git a/libcortex_a9/src/asm.rs b/libcortex_a9/src/asm.rs
index 5b3aa15..04272a8 100644
--- a/libcortex_a9/src/asm.rs
+++ b/libcortex_a9/src/asm.rs
@@ -54,7 +54,7 @@ pub unsafe fn enter_critical() -> bool {
     let mut cpsr: u32;
     asm!(
         "mrs {}, cpsr
-         cpsid i", lateout(reg) cpsr);
+         cpsid i", out(reg) cpsr);
     (cpsr & (1 << 7)) == 0
 }