diff --git a/ArduCopter/Copter.h b/ArduCopter/Copter.h
index 2ada00a75e..e8c7c19d05 100644
--- a/ArduCopter/Copter.h
+++ b/ArduCopter/Copter.h
@@ -48,7 +48,7 @@
 #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 <AP_Mission/AP_Mission.h>     // Mission command library
 #include <AC_PID/AC_PID.h>             // PID library
 #include <AC_PID/AC_PI_2D.h>           // PID library (2-axis)
 #include <AC_PID/AC_HELI_PID.h>        // Heli specific Rate PID library