diff --git a/ArduCopter/defines.h b/ArduCopter/defines.h
index 01675f3212..d6c0046255 100644
--- a/ArduCopter/defines.h
+++ b/ArduCopter/defines.h
@@ -86,6 +86,7 @@
 #define OCTA_FRAME 5
 #define HELI_FRAME 6
 #define OCTA_QUAD_FRAME 7
+#define SINGLE_FRAME 8
 
 #define PLUS_FRAME 0
 #define X_FRAME 1