diff --git a/src/drivers/px4fmu/fmu.cpp b/src/drivers/px4fmu/fmu.cpp
index 4971f49011..72633bee59 100644
--- a/src/drivers/px4fmu/fmu.cpp
+++ b/src/drivers/px4fmu/fmu.cpp
@@ -168,9 +168,6 @@ public:
 	int		set_mode(Mode mode);
 	Mode		get_mode() { return _mode; }
 
-	int		set_pwm_alt_rate(unsigned rate);
-	int		set_pwm_alt_channels(uint32_t channels);
-
 	static int	set_i2c_bus_clock(unsigned bus, unsigned clock_hz);
 
 	static void	capture_trampoline(void *context, uint32_t chan_index,
@@ -815,18 +812,6 @@ PX4FMU::set_pwm_rate(uint32_t rate_map, unsigned default_rate, unsigned alt_rate
 	return OK;
 }
 
-int
-PX4FMU::set_pwm_alt_rate(unsigned rate)
-{
-	return set_pwm_rate(_pwm_alt_rate_channels, _pwm_default_rate, rate);
-}
-
-int
-PX4FMU::set_pwm_alt_channels(uint32_t channels)
-{
-	return set_pwm_rate(channels, _pwm_default_rate, _pwm_alt_rate);
-}
-
 int
 PX4FMU::set_i2c_bus_clock(unsigned bus, unsigned clock_hz)
 {