diff --git a/libraries/AP_HAL/GPIO.h b/libraries/AP_HAL/GPIO.h
index 03ac83a5d4..d21721ebfa 100644
--- a/libraries/AP_HAL/GPIO.h
+++ b/libraries/AP_HAL/GPIO.h
@@ -32,8 +32,6 @@ public:
     virtual uint8_t read(uint8_t pin) = 0;
     virtual void    write(uint8_t pin, uint8_t value) = 0;
     virtual void    toggle(uint8_t pin) = 0;
-    virtual void    setPWMPeriod(uint8_t pin, uint32_t time_us) {};
-    virtual void    setPWMDuty(uint8_t pin, uint8_t percent) {};
     virtual int8_t  analogPinToDigitalPin(uint8_t pin) = 0;
 
     /* Alternative interface: */