diff --git a/src/platform_profile_tests.rs b/src/platform_profile_tests.rs
index 96286b863..f499e86c4 100644
--- a/src/platform_profile_tests.rs
+++ b/src/platform_profile_tests.rs
@@ -42,6 +42,10 @@ mod tests {
     fn virtio_cfg(profile: MachineProfile) -> MachineConfig {
         let mut cfg = minimal_cfg();
         cfg.machine.profile = profile;
+        // The Octane refuses the default R4400.
+        if !profile.cpus().contains(&cfg.machine.cpu) {
+            cfg.machine.cpu = profile.cpus()[0];
+        }
         cfg.virtio_serial.enabled = true;
         cfg
     }