diff --git a/ROMFS/px4fmu_common/init.d/rc.interface b/ROMFS/px4fmu_common/init.d/rc.interface
index 67f42f275e..eaadea3e12 100644
--- a/ROMFS/px4fmu_common/init.d/rc.interface
+++ b/ROMFS/px4fmu_common/init.d/rc.interface
@@ -25,11 +25,7 @@ then
         fi
 fi
 
-if ver hwcmp INTEL_AEROFC_V1 AV_X_V1 BITCRAZE_CRAZYFLIE AIRMIND_MINDPX_V2 NXP_FMUK66_V3 PX4_FMU_V4 OMNIBUS_F4SD PX4_SITL
-then
-	set MIXER_AUX none
-fi
-
+# USE_IO is set to 'no' for all boards w/o px4io driver or SYS_USE_IO disabled
 if [ $USE_IO = no ]
 then
 	set MIXER_AUX none
diff --git a/boards/airmind/mindpx-v2/init/rc.board_defaults b/boards/airmind/mindpx-v2/init/rc.board_defaults
index 23fc87c113..77a1dfb795 100644
--- a/boards/airmind/mindpx-v2/init/rc.board_defaults
+++ b/boards/airmind/mindpx-v2/init/rc.board_defaults
@@ -11,4 +11,3 @@ then
 
 fi
 
-set MIXER_AUX none
diff --git a/boards/av/x-v1/init/rc.board_defaults b/boards/av/x-v1/init/rc.board_defaults
index e02a7273b5..cab36b7cfe 100644
--- a/boards/av/x-v1/init/rc.board_defaults
+++ b/boards/av/x-v1/init/rc.board_defaults
@@ -10,4 +10,3 @@ then
 fi
 
 set LOGGER_BUF 64
-set MIXER_AUX none
diff --git a/boards/bitcraze/crazyflie/init/rc.board_defaults b/boards/bitcraze/crazyflie/init/rc.board_defaults
index 92a71ce4fb..8b119fc42a 100644
--- a/boards/bitcraze/crazyflie/init/rc.board_defaults
+++ b/boards/bitcraze/crazyflie/init/rc.board_defaults
@@ -15,4 +15,3 @@ then
 
 fi
 
-set MIXER_AUX none
diff --git a/boards/intel/aerofc-v1/init/rc.board_defaults b/boards/intel/aerofc-v1/init/rc.board_defaults
index 6a63205fa5..7144df2d8b 100644
--- a/boards/intel/aerofc-v1/init/rc.board_defaults
+++ b/boards/intel/aerofc-v1/init/rc.board_defaults
@@ -15,4 +15,3 @@ param set SYS_AUTOSTART 4070
 
 set DATAMAN_OPT -i
 set LOGGER_ARGS "-m mavlink"
-set MIXER_AUX none
diff --git a/boards/nxp/fmuk66-v3/init/rc.board_defaults b/boards/nxp/fmuk66-v3/init/rc.board_defaults
index 78eca13a10..52739b0d63 100644
--- a/boards/nxp/fmuk66-v3/init/rc.board_defaults
+++ b/boards/nxp/fmuk66-v3/init/rc.board_defaults
@@ -9,4 +9,3 @@ then
 
 fi
 
-set MIXER_AUX none
diff --git a/boards/omnibus/f4sd/init/rc.board_defaults b/boards/omnibus/f4sd/init/rc.board_defaults
index e26bffe55f..08963709f0 100644
--- a/boards/omnibus/f4sd/init/rc.board_defaults
+++ b/boards/omnibus/f4sd/init/rc.board_defaults
@@ -25,4 +25,3 @@ then
 	param set SYS_HAS_MAG 0
 fi
 
-set MIXER_AUX none
diff --git a/boards/px4/fmu-v4/init/rc.board_defaults b/boards/px4/fmu-v4/init/rc.board_defaults
index 40d7e281e5..186da5ee37 100644
--- a/boards/px4/fmu-v4/init/rc.board_defaults
+++ b/boards/px4/fmu-v4/init/rc.board_defaults
@@ -11,4 +11,3 @@ then
 
 fi
 
-set MIXER_AUX none