diff --git a/mk/make.inc b/mk/make.inc
index d1a79223c2..a69b3eefbc 100644
--- a/mk/make.inc
+++ b/mk/make.inc
@@ -23,4 +23,4 @@ LIBRARIES += AP_ROMFS
 LIBRARIES += AC_Sprayer
 LIBRARIES += AC_Avoidance
 LIBRARIES += AP_LandingGear
-
+LIBRARIES += AC_AutoTune