diff --git a/ArduCopter/Copter.h b/ArduCopter/Copter.h
index 0241f23281..3a3316c4b4 100644
--- a/ArduCopter/Copter.h
+++ b/ArduCopter/Copter.h
@@ -47,11 +47,6 @@
 #include <AP_NavEKF2/AP_NavEKF2.h>
 #include <AP_NavEKF3/AP_NavEKF3.h>
 #include <AP_Mission/AP_Mission.h>     // Mission command library
-#include <AC_PID/AC_P.h>               // P library
-#include <AC_PID/AC_PID.h>             // PID library
-#include <AC_PID/AC_PI_2D.h>           // PI  library (2-axis)
-#include <AC_PID/AC_PID_2D.h>          // PID library (2-axis)
-#include <AC_PID/AC_HELI_PID.h>        // Heli specific Rate PID library
 #include <AC_AttitudeControl/AC_AttitudeControl_Multi.h> // Attitude control library
 #include <AC_AttitudeControl/AC_AttitudeControl_Heli.h> // Attitude control library for traditional helicopter
 #include <AC_AttitudeControl/AC_PosControl.h>      // Position control library