diff --git a/src/drivers/drv_mixer.h b/src/drivers/drv_mixer.h
index f2e3701b72..961ba442b1 100644
--- a/src/drivers/drv_mixer.h
+++ b/src/drivers/drv_mixer.h
@@ -71,11 +71,6 @@
 /** reset (clear) the mixer configuration */
 #define MIXERIOCRESET		_MIXERIOC(1)
 
-/**
- * add a simple mixer in (struct mixer_simple_s *)arg
- */
-#define MIXERIOCADDSIMPLE	_MIXERIOC(2)
-
 /* _MIXERIOC(3) was deprecated */
 /* _MIXERIOC(4) was deprecated */
 
diff --git a/src/drivers/mkblctrl/mkblctrl.cpp b/src/drivers/mkblctrl/mkblctrl.cpp
index 3fdb3cf08d..79cfd03d74 100644
--- a/src/drivers/mkblctrl/mkblctrl.cpp
+++ b/src/drivers/mkblctrl/mkblctrl.cpp
@@ -1052,27 +1052,6 @@ MK::pwm_ioctl(file *filp, int cmd, unsigned long arg)
 
 		break;
 
-	case MIXERIOCADDSIMPLE: {
-			mixer_simple_s *mixinfo = (mixer_simple_s *)arg;
-
-			SimpleMixer *mixer = new SimpleMixer(control_callback,
-							     (uintptr_t)&_controls, mixinfo);
-
-			if (mixer->check()) {
-				delete mixer;
-				ret = -EINVAL;
-
-			} else {
-				if (_mixers == nullptr)
-					_mixers = new MixerGroup(control_callback,
-								 (uintptr_t)&_controls);
-
-				_mixers->add_mixer(mixer);
-			}
-
-			break;
-		}
-
 	case MIXERIOCLOADBUF: {
 			const char *buf = (const char *)arg;
 			unsigned buflen = strnlen(buf, 1024);
diff --git a/src/drivers/pwm_out_sim/PWMSim.cpp b/src/drivers/pwm_out_sim/PWMSim.cpp
index 0e8dc0417c..3aea68c915 100644
--- a/src/drivers/pwm_out_sim/PWMSim.cpp
+++ b/src/drivers/pwm_out_sim/PWMSim.cpp
@@ -517,28 +517,6 @@ PWMSim::ioctl(device::file_t *filp, int cmd, unsigned long arg)
 
 		break;
 
-	case MIXERIOCADDSIMPLE: {
-			mixer_simple_s *mixinfo = (mixer_simple_s *)arg;
-
-			SimpleMixer *mixer = new SimpleMixer(control_callback, (uintptr_t)&_controls, mixinfo);
-
-			if (mixer->check()) {
-				delete mixer;
-				_groups_required = 0;
-				ret = -EINVAL;
-
-			} else {
-				if (_mixers == nullptr) {
-					_mixers = new MixerGroup(control_callback, (uintptr_t)&_controls);
-				}
-
-				_mixers->add_mixer(mixer);
-				_mixers->groups_required(_groups_required);
-			}
-
-			break;
-		}
-
 	case MIXERIOCLOADBUF: {
 			const char *buf = (const char *)arg;
 			unsigned buflen = strnlen(buf, 1024);
diff --git a/src/drivers/px4fmu/fmu.cpp b/src/drivers/px4fmu/fmu.cpp
index 93314ca0de..4971f49011 100644
--- a/src/drivers/px4fmu/fmu.cpp
+++ b/src/drivers/px4fmu/fmu.cpp
@@ -2152,28 +2152,6 @@ PX4FMU::pwm_ioctl(file *filp, int cmd, unsigned long arg)
 
 		break;
 
-	case MIXERIOCADDSIMPLE: {
-			mixer_simple_s *mixinfo = (mixer_simple_s *)arg;
-
-			SimpleMixer *mixer = new SimpleMixer(control_callback, (uintptr_t)_controls, mixinfo);
-
-			if (mixer->check()) {
-				delete mixer;
-				_groups_required = 0;
-				ret = -EINVAL;
-
-			} else {
-				if (_mixers == nullptr) {
-					_mixers = new MixerGroup(control_callback, (uintptr_t)_controls);
-				}
-
-				_mixers->add_mixer(mixer);
-				_mixers->groups_required(_groups_required);
-			}
-
-			break;
-		}
-
 	case MIXERIOCLOADBUF: {
 			const char *buf = (const char *)arg;
 			unsigned buflen = strnlen(buf, 1024);