diff --git a/sw/airborne/booz/booz2_navigation.c b/sw/airborne/booz/booz2_navigation.c
index 04d008eb55..0612ebfdad 100644
--- a/sw/airborne/booz/booz2_navigation.c
+++ b/sw/airborne/booz/booz2_navigation.c
@@ -241,6 +241,9 @@ static inline void nav_set_altitude( void ) {
 unit_t nav_reset_reference( void ) {
   booz_ins_ltp_initialised = FALSE;
   booz_ins_vff_realign = TRUE;
+#ifdef USE_HFF
+  booz_ins_hff_realign = TRUE;
+#endif
   return 0;
 }