diff --git a/sw/airborne/arch/sim/modules/ins/ins_arduimu_basic.c b/sw/airborne/arch/sim/modules/ins/ins_arduimu_basic.c
index 5b6e96f2d5..4cde8cfdb8 100644
--- a/sw/airborne/arch/sim/modules/ins/ins_arduimu_basic.c
+++ b/sw/airborne/arch/sim/modules/ins/ins_arduimu_basic.c
@@ -23,6 +23,7 @@ struct FloatVect3 arduimu_accel;
 
 float ins_roll_neutral;
 float ins_pitch_neutral;
+bool_t arduimu_calibrate_neutrals;
 
 void ArduIMU_init( void ) {}
 void ArduIMU_periodic( void ) {}