diff --git a/libraries/AP_HAL/Scheduler.h b/libraries/AP_HAL/Scheduler.h
index cfb2c0d05a..ecf3856d21 100644
--- a/libraries/AP_HAL/Scheduler.h
+++ b/libraries/AP_HAL/Scheduler.h
@@ -36,6 +36,11 @@ public:
 
     // register a high priority timer task
     virtual void     register_timer_process(AP_HAL::MemberProc) = 0;
+    virtual bool     register_timer_process(AP_HAL::MemberProc proc, uint8_t freq_div)
+    {
+        register_timer_process(proc);
+        return false;
+    }
 
     // register a low priority IO task
     virtual void     register_io_process(AP_HAL::MemberProc) = 0;