diff --git a/libraries/AP_HAL/Scheduler.h b/libraries/AP_HAL/Scheduler.h
index 18b89f6885..9d62c0dbb1 100644
--- a/libraries/AP_HAL/Scheduler.h
+++ b/libraries/AP_HAL/Scheduler.h
@@ -59,11 +59,6 @@ public:
     virtual void     panic(const char *errormsg, ...) FORMAT(2, 3) NORETURN = 0;
     virtual void     reboot(bool hold_in_bootloader) = 0;
 
-    /**
-       optional function to set timer speed in Hz
-     */
-    virtual void     set_timer_speed(uint16_t speed_hz) {}
-
     /**
        optional function to stop clock at a given time, used by log replay
      */