diff --git a/ArduCopter/ArduCopter.pde b/ArduCopter/ArduCopter.pde
index 9ac8ef9e92..6c9e643b6f 100644
--- a/ArduCopter/ArduCopter.pde
+++ b/ArduCopter/ArduCopter.pde
@@ -924,7 +924,7 @@ static void fast_loop()
     // check if we've landed or crashed
     update_land_and_crash_detectors();
 
-    //update_motor_fail_detector();
+    update_motor_fail_detector();
 
     gps_glitch_update();