diff --git a/sw/airborne/firmwares/fixedwing/autopilot.h b/sw/airborne/firmwares/fixedwing/autopilot.h
index 850e9c1c37..68f2a08bcc 100644
--- a/sw/airborne/firmwares/fixedwing/autopilot.h
+++ b/sw/airborne/firmwares/fixedwing/autopilot.h
@@ -33,6 +33,7 @@
 #include <inttypes.h>
 #include "std.h"
 #include "sys_time.h"
+#include "estimator.h"
 
 #define TRESHOLD_MANUAL_PPRZ (MIN_PPRZ / 2)