diff --git a/ArduCopter/Copter.h b/ArduCopter/Copter.h
index fdf990c16b..b6ae3b09b2 100644
--- a/ArduCopter/Copter.h
+++ b/ArduCopter/Copter.h
@@ -199,7 +199,7 @@ private:
 
     // Optical flow sensor
 #if OPTFLOW == ENABLED
-    OpticalFlow optflow;
+    OpticalFlow optflow{ahrs};
 #endif
 
     // gnd speed limit required to observe optical flow sensor limits