diff --git a/ArduCopter/make.inc b/ArduCopter/make.inc
index 56d1119208..50a61f0440 100644
--- a/ArduCopter/make.inc
+++ b/ArduCopter/make.inc
@@ -37,6 +37,7 @@ LIBRARIES += AP_Mount
 LIBRARIES += AP_Vehicle
 LIBRARIES += AP_InertialNav
 LIBRARIES += AC_WPNav
+LIBRARIES += AC_Loiter
 LIBRARIES += AC_Circle
 LIBRARIES += AP_Declination
 LIBRARIES += AC_Fence