diff --git a/ArduCopter/Log.cpp b/ArduCopter/Log.cpp
index da346335ba..f1f58f82f4 100644
--- a/ArduCopter/Log.cpp
+++ b/ArduCopter/Log.cpp
@@ -457,7 +457,7 @@ const struct LogStructure Copter::log_structure[] = {
     { LOG_PARAMTUNE_MSG, sizeof(log_ParameterTuning),
       "PTUN", "QBfff",         "TimeUS,Param,TunVal,TunMin,TunMax", "s----", "F----" },
     { LOG_CONTROL_TUNING_MSG, sizeof(log_Control_Tuning),
-      "CTUN", "Qffffffefffhhf", "TimeUS,ThI,ABst,ThO,ThH,DAlt,Alt,BAlt,DSAlt,SAlt,TAlt,DCRt,CRt,N", "s----mmmmmmnnz", "F----00B0BBBB-" },
+      "CTUN", "Qffffffefffhhf", "TimeUS,ThI,ABst,ThO,ThH,DAlt,Alt,BAlt,DSAlt,SAlt,TAlt,DCRt,CRt,N", "s----mmmmmmnnz", "F----00B0B0BB-" },
     { LOG_MOTBATT_MSG, sizeof(log_MotBatt),
       "MOTB", "Qffff",  "TimeUS,LiftMax,BatVolt,BatRes,ThLimit", "s-vw-", "F-00-" },
     { LOG_DATA_INT16_MSG, sizeof(log_Data_Int16t),