diff --git a/conf/firmwares/subsystems/rotorcraft/ahrs_float_cmpl_quat.makefile b/conf/firmwares/subsystems/rotorcraft/ahrs_float_cmpl_quat.makefile
index 4e1cf5090d..0e0b595620 100644
--- a/conf/firmwares/subsystems/rotorcraft/ahrs_float_cmpl_quat.makefile
+++ b/conf/firmwares/subsystems/rotorcraft/ahrs_float_cmpl_quat.makefile
@@ -7,7 +7,7 @@
 
 USE_MAGNETOMETER ?= 1
 
-AHRS_CFLAGS  = -DUSE_AHRS
+AHRS_CFLAGS  = -DUSE_AHRS -DAHRS_FLOAT
 AHRS_CFLAGS += -DUSE_AHRS_ALIGNER
 
 ifneq ($(USE_MAGNETOMETER),0)