diff --git a/mk/make.inc b/mk/make.inc
index a04a04082e..4ec981703d 100644
--- a/mk/make.inc
+++ b/mk/make.inc
@@ -16,3 +16,4 @@ LIBRARIES += AP_Radio
 LIBRARIES += AP_Param_Helper
 LIBRARIES += AP_VisualOdom
 LIBRARIES += AP_RSSI
+LIBRARIES += AP_Proximity