diff --git a/libraries/AP_Scheduler/AP_Scheduler.cpp b/libraries/AP_Scheduler/AP_Scheduler.cpp
index 4d6e84a50a1..1e70e3d5a34 100644
--- a/libraries/AP_Scheduler/AP_Scheduler.cpp
+++ b/libraries/AP_Scheduler/AP_Scheduler.cpp
@@ -25,7 +25,7 @@
 #include <AP_Vehicle/AP_Vehicle.h>
 #include <stdio.h>
 
-#if APM_BUILD_TYPE(APM_BUILD_ArduCopter)
+#if APM_BUILD_TYPE(APM_BUILD_ArduCopter) || APM_BUILD_TYPE(APM_BUILD_ArduSub)
 #define SCHEDULER_DEFAULT_LOOP_RATE 400
 #else
 #define SCHEDULER_DEFAULT_LOOP_RATE  50