diff --git a/libraries/AP_HAL/Scheduler.h b/libraries/AP_HAL/Scheduler.h
index 0f047617f0..d8ef0b237e 100644
--- a/libraries/AP_HAL/Scheduler.h
+++ b/libraries/AP_HAL/Scheduler.h
@@ -70,7 +70,7 @@ public:
     virtual void     set_system_initialized() = 0;
     virtual bool     is_system_initialized() = 0;
 
-    virtual void     reboot(bool hold_in_bootloader) = 0;
+    virtual void     reboot(bool hold_in_bootloader = false) = 0;
 
     /**
        optional function to stop clock at a given time, used by log replay