diff --git a/ArduSub/system.cpp b/ArduSub/system.cpp
index 7a731468b6..fad675a587 100644
--- a/ArduSub/system.cpp
+++ b/ArduSub/system.cpp
@@ -83,11 +83,6 @@ void Sub::init_ardupilot()
     AP::compass().set_log_bit(MASK_LOG_COMPASS);
     AP::compass().init();
 
-#if OPTFLOW == ENABLED
-    // make optflow available to AHRS
-    ahrs.set_optflow(&optflow);
-#endif
-
     // init Location class
 #if AP_TERRAIN_AVAILABLE && AC_TERRAIN
     Location::set_terrain(&terrain);