diff --git a/ArduSub/Sub.h b/ArduSub/Sub.h
index 9cc72bddfc..8e006bbab3 100644
--- a/ArduSub/Sub.h
+++ b/ArduSub/Sub.h
@@ -45,8 +45,6 @@
 #include <AP_Compass/AP_Compass.h>         // ArduPilot Mega Magnetometer Library
 #include <AP_InertialSensor/AP_InertialSensor.h>  // ArduPilot Mega Inertial Sensor (accel & gyro) Library
 #include <AP_AHRS/AP_AHRS.h>
-#include <AP_NavEKF2/AP_NavEKF2.h>
-#include <AP_NavEKF3/AP_NavEKF3.h>
 #include <AP_Mission/AP_Mission.h>         // Mission command library
 #include <AC_AttitudeControl/AC_AttitudeControl_Sub.h> // Attitude control library
 #include <AC_AttitudeControl/AC_PosControl_Sub.h>      // Position control library