diff --git a/sw/airborne/firmwares/rotorcraft/guidance/guidance_h_ref.c b/sw/airborne/firmwares/rotorcraft/guidance/guidance_h_ref.c
index 31c82fcadcf..c6a39793c0b 100644
--- a/sw/airborne/firmwares/rotorcraft/guidance/guidance_h_ref.c
+++ b/sw/airborne/firmwares/rotorcraft/guidance/guidance_h_ref.c
@@ -53,7 +53,7 @@ struct Int64Vect2 gh_pos_ref;
 #ifndef GUIDANCE_H_REF_MAX_ACCEL
 #define GUIDANCE_H_REF_MAX_ACCEL 5.66
 #endif
-#define GH_MAX_ACCEL BFP_OF_REAL(GUIDANCE_H_REF_MAX_ACCEL, GH_ACCEL_REF_FRAC)
+static const int32_t gh_max_accel =  BFP_OF_REAL(GUIDANCE_H_REF_MAX_ACCEL, GH_ACCEL_REF_FRAC);
 
 /** Speed saturation */
 #ifndef GUIDANCE_H_REF_MAX_SPEED
@@ -61,7 +61,7 @@ struct Int64Vect2 gh_pos_ref;
 #endif
 /** @todo GH_MAX_SPEED must be limited to 2^14 to avoid overflow */
 #define GH_MAX_SPEED_REF_FRAC 7
-#define GH_MAX_SPEED BFP_OF_REAL(GUIDANCE_H_REF_MAX_SPEED, GH_MAX_SPEED_REF_FRAC)
+static const int32_t gh_max_speed = BFP_OF_REAL(GUIDANCE_H_REF_MAX_SPEED, GH_MAX_SPEED_REF_FRAC);
 
 /** second order model natural frequency */
 #ifndef GUIDANCE_H_REF_OMEGA
@@ -72,16 +72,16 @@ struct Int64Vect2 gh_pos_ref;
 #define GUIDANCE_H_REF_ZETA  0.85
 #endif
 #define GH_ZETA_OMEGA_FRAC 10
-#define GH_ZETA_OMEGA BFP_OF_REAL((GUIDANCE_H_REF_ZETA*GUIDANCE_H_REF_OMEGA), GH_ZETA_OMEGA_FRAC)
 #define GH_OMEGA_2_FRAC 7
-#define GH_OMEGA_2    BFP_OF_REAL((GUIDANCE_H_REF_OMEGA*GUIDANCE_H_REF_OMEGA), GH_OMEGA_2_FRAC)
+static const int32_t gh_zeta_omega = BFP_OF_REAL((GUIDANCE_H_REF_ZETA*GUIDANCE_H_REF_OMEGA), GH_ZETA_OMEGA_FRAC);
+static const int32_t gh_omega_2= BFP_OF_REAL((GUIDANCE_H_REF_OMEGA*GUIDANCE_H_REF_OMEGA), GH_OMEGA_2_FRAC);
 
 /** first order time constant */
 #ifndef GUIDANCE_H_REF_TAU
 #define GUIDANCE_H_REF_TAU 0.5
 #endif
 #define GH_REF_INV_TAU_FRAC 16
-#define GH_REF_INV_TAU  BFP_OF_REAL((1./GUIDANCE_H_REF_TAU), GH_REF_INV_TAU_FRAC)
+static const int32_t gh_ref_inv_tau = BFP_OF_REAL((1./GUIDANCE_H_REF_TAU), GH_REF_INV_TAU_FRAC);
 
 static struct Int32Vect2 gh_max_speed_ref;
 static struct Int32Vect2 gh_max_accel_ref;
@@ -111,7 +111,7 @@ void gh_update_ref_from_pos_sp(struct Int32Vect2 pos_sp) {
   // compute the "speed part" of accel = -2*zeta*omega*speed -omega^2(pos - pos_sp)
   struct Int32Vect2 speed;
   INT32_VECT2_RSHIFT(speed, gh_speed_ref, (GH_SPEED_REF_FRAC - GH_ACCEL_REF_FRAC));
-  VECT2_SMUL(speed, speed, -2*GH_ZETA_OMEGA);
+  VECT2_SMUL(speed, speed, -2 * gh_zeta_omega);
   INT32_VECT2_RSHIFT(speed, speed, GH_ZETA_OMEGA_FRAC);
   // compute pos error in pos_sp resolution
   struct Int32Vect2 pos_err;
@@ -121,7 +121,7 @@ void gh_update_ref_from_pos_sp(struct Int32Vect2 pos_sp) {
   INT32_VECT2_RSHIFT(pos_err, pos_err, (INT32_POS_FRAC - GH_ACCEL_REF_FRAC));
   // compute the "pos part" of accel
   struct Int32Vect2 pos;
-  VECT2_SMUL(pos, pos_err, (-GH_OMEGA_2));
+  VECT2_SMUL(pos, pos_err, -gh_omega_2);
   INT32_VECT2_RSHIFT(pos, pos, GH_OMEGA_2_FRAC);
   // sum accel
   VECT2_SUM(gh_accel_ref, speed, pos);
@@ -146,7 +146,7 @@ void gh_update_ref_from_speed_sp(struct Int32Vect2 speed_sp) {
   // convert to accel resolution
   INT32_VECT2_RSHIFT(speed_err, speed_err, (GH_SPEED_REF_FRAC - GH_ACCEL_REF_FRAC));
   // compute accel from speed_sp
-  VECT2_SMUL(gh_accel_ref, speed_err, -GH_REF_INV_TAU);
+  VECT2_SMUL(gh_accel_ref, speed_err, -gh_ref_inv_tau);
   INT32_VECT2_RSHIFT(gh_accel_ref, gh_accel_ref, GH_REF_INV_TAU_FRAC);
 
   /* Compute max ref accel/speed along route before saturation */
@@ -159,10 +159,10 @@ void gh_update_ref_from_speed_sp(struct Int32Vect2 speed_sp) {
 static void gh_compute_max_ref(struct Int32Vect2* ref_vector) {
   /* Compute route reference before saturation */
   if (ref_vector->x == 0 && ref_vector->y == 0) {
-    gh_max_accel_ref.x = GH_MAX_ACCEL;
-    gh_max_accel_ref.y = GH_MAX_ACCEL;
-    gh_max_speed_ref.x = GH_MAX_SPEED;
-    gh_max_speed_ref.y = GH_MAX_SPEED;
+    gh_max_accel_ref.x = gh_max_accel;
+    gh_max_accel_ref.y = gh_max_accel;
+    gh_max_speed_ref.x = gh_max_speed;
+    gh_max_speed_ref.y = gh_max_speed;
   }
   else {
     float f_route_ref = atan2f(-ref_vector->y, -ref_vector->x);
@@ -173,11 +173,11 @@ static void gh_compute_max_ref(struct Int32Vect2* ref_vector) {
     c_route_ref = abs(c_route_ref);
     s_route_ref = abs(s_route_ref);
     /* Compute maximum acceleration*/
-    gh_max_accel_ref.x = INT_MULT_RSHIFT((int32_t)GH_MAX_ACCEL, c_route_ref, INT32_TRIG_FRAC);
-    gh_max_accel_ref.y = INT_MULT_RSHIFT((int32_t)GH_MAX_ACCEL, s_route_ref, INT32_TRIG_FRAC);
+    gh_max_accel_ref.x = INT_MULT_RSHIFT(gh_max_accel, c_route_ref, INT32_TRIG_FRAC);
+    gh_max_accel_ref.y = INT_MULT_RSHIFT(gh_max_accel, s_route_ref, INT32_TRIG_FRAC);
     /* Compute maximum speed*/
-    gh_max_speed_ref.x = INT_MULT_RSHIFT((int32_t)GH_MAX_SPEED, c_route_ref, INT32_TRIG_FRAC);
-    gh_max_speed_ref.y = INT_MULT_RSHIFT((int32_t)GH_MAX_SPEED, s_route_ref, INT32_TRIG_FRAC);
+    gh_max_speed_ref.x = INT_MULT_RSHIFT(gh_max_speed, c_route_ref, INT32_TRIG_FRAC);
+    gh_max_speed_ref.y = INT_MULT_RSHIFT(gh_max_speed, s_route_ref, INT32_TRIG_FRAC);
     /* restore gh_speed_ref range (Q14.17) */
     INT32_VECT2_LSHIFT(gh_max_speed_ref, gh_max_speed_ref, (GH_SPEED_REF_FRAC - GH_MAX_SPEED_REF_FRAC));
   }