diff --git a/ArduCopter/APM_Config.h b/ArduCopter/APM_Config.h
index 97e59f6999..15372c99bb 100644
--- a/ArduCopter/APM_Config.h
+++ b/ArduCopter/APM_Config.h
@@ -36,6 +36,7 @@
 //#define OPTFLOW               ENABLED             // enable optical flow sensor and OF_LOITER flight mode at a cost of 5K of flash space
 
 // features below are disabled by default on all boards
+#define OPTFLOW               ENABLED             // enable optical flow sensor and OF_LOITER flight mode at a cost of 5K of flash space
 //#define SPRAYER               ENABLED             // enable the crop sprayer feature (two ESC controlled pumps the speed of which depends upon the vehicle's horizontal velocity)
 
 // other settings