diff --git a/conf/autopilot/subsystems/fixedwing/imu_analog.makefile b/conf/autopilot/subsystems/fixedwing/imu_analog.makefile
index c8c6cae3cd..499706aa75 100644
--- a/conf/autopilot/subsystems/fixedwing/imu_analog.makefile
+++ b/conf/autopilot/subsystems/fixedwing/imu_analog.makefile
@@ -48,7 +48,7 @@ imu_CFLAGS += -DIMU_TYPE_H=\"subsystems/imu/imu_analog.h\"
 
 imu_CFLAGS += -DADC
 imu_CFLAGS += -DUSE_$(GYRO_P) -DUSE_$(GYRO_Q) -DUSE_$(GYRO_R)
-imu_CFLAGS += -DUSE_$(ACCEL_X) -DUSE_$(ACCEL_y) -DUSE_$(ACCEL_Z)
+imu_CFLAGS += -DUSE_$(ACCEL_X) -DUSE_$(ACCEL_Y) -DUSE_$(ACCEL_Z)
 
 imu_CFLAGS += -DADC_CHANNEL_GYRO_P=$(GYRO_P) -DADC_CHANNEL_GYRO_Q=$(GYRO_Q) -DADC_CHANNEL_GYRO_R=$(GYRO_R)
 imu_CFLAGS += -DADC_CHANNEL_ACCEL_X=$(ACCEL_X) -DADC_CHANNEL_ACCEL_Y=$(ACCEL_Y) -DADC_CHANNEL_ACCEL_Z=$(ACCEL_Z)