diff --git a/src/main/flight/servos.c b/src/main/flight/servos.c
index c2113e0c3d..704e2d79a5 100755
--- a/src/main/flight/servos.c
+++ b/src/main/flight/servos.c
@@ -116,21 +116,29 @@ static const servoMixer_t servoMixerFlyingWing[] = {
     { SERVO_THROTTLE,    INPUT_STABILIZED_THROTTLE, 100, 0, 0, 100, 0 },
 };
 
+#if defined(USE_UNCOMMON_MIXERS)
 static const servoMixer_t servoMixerBI[] = {
     { SERVO_BICOPTER_LEFT, INPUT_STABILIZED_YAW,   100, 0, 0, 100, 0 },
     { SERVO_BICOPTER_LEFT, INPUT_STABILIZED_PITCH, -100, 0, 0, 100, 0 },
     { SERVO_BICOPTER_RIGHT, INPUT_STABILIZED_YAW,   100, 0, 0, 100, 0 },
     { SERVO_BICOPTER_RIGHT, INPUT_STABILIZED_PITCH, 100, 0, 0, 100, 0 },
 };
+#else
+#define servoMixerBI NULL
+#endif
 
 static const servoMixer_t servoMixerTri[] = {
     { SERVO_RUDDER, INPUT_STABILIZED_YAW,   100, 0, 0, 100, 0 },
 };
 
+#if defined(USE_UNCOMMON_MIXERS)
 static const servoMixer_t servoMixerDual[] = {
     { SERVO_DUALCOPTER_LEFT, INPUT_STABILIZED_PITCH, 100, 0, 0, 100, 0 },
     { SERVO_DUALCOPTER_RIGHT, INPUT_STABILIZED_ROLL,  100, 0, 0, 100, 0 },
 };
+#else
+#define servoMixerDual NULL
+#endif
 
 static const servoMixer_t servoMixerSingle[] = {
     { SERVO_SINGLECOPTER_1, INPUT_STABILIZED_YAW,   100, 0, 0, 100, 0 },