diff --git a/APMrover2/make.inc b/APMrover2/make.inc
index fcb50680ad..94aff52cea 100644
--- a/APMrover2/make.inc
+++ b/APMrover2/make.inc
@@ -54,4 +54,5 @@ LIBRARIES += AP_BattMonitor
 LIBRARIES += AP_OpticalFlow
 LIBRARIES += AP_RSSI
 LIBRARIES += AP_Declination
+LIBRARIES += AP_RPM