diff --git a/libraries/AP_Compass/AP_Compass_Backend.h b/libraries/AP_Compass/AP_Compass_Backend.h
index cbb81d8e2a..e52ee2ea3d 100644
--- a/libraries/AP_Compass/AP_Compass_Backend.h
+++ b/libraries/AP_Compass/AP_Compass_Backend.h
@@ -58,7 +58,8 @@ public:
         DEVTYPE_MAG3110  = 0x0E,
         DEVTYPE_SITL  = 0x0F,
         DEVTYPE_IST8308 = 0x10,
-		DEVTYPE_RM3100 = 0x11,
+        DEVTYPE_RM3100_OLD = 0x11,
+        DEVTYPE_RM3100 = 0x12,
     };