diff --git a/libraries/AP_SerialManager/AP_SerialManager.h b/libraries/AP_SerialManager/AP_SerialManager.h
index f3a1bcf254..b06b30313b 100644
--- a/libraries/AP_SerialManager/AP_SerialManager.h
+++ b/libraries/AP_SerialManager/AP_SerialManager.h
@@ -154,6 +154,7 @@ public:
         SerialProtocol_FETtecOneWire = 38,
         SerialProtocol_Torqeedo = 39,
         SerialProtocol_AIS = 40,
+        SerialProtocol_CoDevESC = 41,
         SerialProtocol_NumProtocols                    // must be the last value
     };