diff --git a/libraries/SITL/SITL.h b/libraries/SITL/SITL.h
index 4d7394a7c4bb3a..43ea1af5681542 100644
--- a/libraries/SITL/SITL.h
+++ b/libraries/SITL/SITL.h
@@ -416,6 +416,7 @@ class SIM {
     } opos;
 
     uint16_t irlock_port;
+    uint16_t rcin_port;
 
     time_t start_time_UTC;