diff --git a/conf/autopilot/subsystems/fixedwing/attitude_analogimu.makefile b/conf/autopilot/subsystems/fixedwing/attitude_analogimu.makefile
index a0f1d4ff90..426da8c8e8 100644
--- a/conf/autopilot/subsystems/fixedwing/attitude_analogimu.makefile
+++ b/conf/autopilot/subsystems/fixedwing/attitude_analogimu.makefile
@@ -2,9 +2,9 @@
 
 
 ifeq ($(ARCH), lpc21)
-ap.CFLAGS += -DUSE_ANALOG_IMU
-ap.CFLAGS += -DADC -DUSE_$(GYRO_P) -DUSE_$(GYRO_Q) -DUSE_ADC_$(GYRO_R)
-ap.CFLAGS += -DUSE_ADC_3 -DUSE_$(ACCEL_X)  -DUSE_$(ACCEL_y) -DUSE_$(ACCEL_Z)
+ap.CFLAGS += -DUSE_ANALOG_IMU -DADC
+ap.CFLAGS += -DUSE_$(GYRO_P) -DUSE_$(GYRO_Q) -DUSE_ADC_$(GYRO_R)
+ap.CFLAGS += -DUSE_$(ACCEL_X)  -DUSE_$(ACCEL_y) -DUSE_$(ACCEL_Z)
 
 ap.CFLAGS += -DADC_CHANNEL_GYRO_P=$(GYRO_P) -DADC_CHANNEL_GYRO_Q=$(GYRO_Q) -DADC_CHANNEL_GYRO_R=$(GYRO_R)
 ap.CFLAGS += -DADC_CHANNEL_ACCEL_X=$(ACCEL_X) -DADC_CHANNEL_ACCEL_Y=$(ACCEL_Y) -DADC_CHANNEL_ACCEL_Z=$(ACCEL_Z)
@@ -17,7 +17,7 @@ ap.srcs += $(SRC_SUBSYSTEMS)/imu.c
 
 endif
 
-# since there is currently no SITL sim for the Analog IMU, we use the infrared sim 
+# since there is currently no SITL sim for the Analog IMU, we use the infrared sim
 
 ifeq ($(TARGET), sim)