diff --git a/nucleus/src/qemu.rs b/nucleus/src/qemu.rs
index c527e24..0229ad2 100644
--- a/nucleus/src/qemu.rs
+++ b/nucleus/src/qemu.rs
@@ -1,4 +1,5 @@
 pub mod semihosting {
+    #[cfg(test)]
     pub fn exit_success() {
         use qemu_exit::QEMUExit;