diff --git a/libraries/AC_PID/examples/AC_PID_test/make.inc b/libraries/AC_PID/examples/AC_PID_test/make.inc
index 64254932b9..e807ab18c7 100644
--- a/libraries/AC_PID/examples/AC_PID_test/make.inc
+++ b/libraries/AC_PID/examples/AC_PID_test/make.inc
@@ -8,6 +8,7 @@ LIBRARIES += AP_Compass
 LIBRARIES += AP_Declination
 LIBRARIES += AP_GPS
 LIBRARIES += AP_InertialSensor
+LIBRARIES += AP_AccelCal
 LIBRARIES += AP_Math
 LIBRARIES += AP_Mission
 LIBRARIES += AP_NavEKF