diff --git a/ArduPlane/ArduPlane.pde b/ArduPlane/ArduPlane.pde
index 42dfe7e6c2..524fc766f0 100644
--- a/ArduPlane/ArduPlane.pde
+++ b/ArduPlane/ArduPlane.pde
@@ -452,7 +452,7 @@ static int		pmTest1 = 0;
 static unsigned long 	fast_loopTimer;				// Time in miliseconds of main control loop
 static unsigned long 	fast_loopTimeStamp;			// Time Stamp when fast loop was complete
 static uint8_t 		delta_ms_fast_loop; 		// Delta Time in miliseconds
-static int 			mainLoop_count;
+static uint16_t			mainLoop_count;
 
 static unsigned long 	medium_loopTimer;			// Time in miliseconds of medium loop
 static byte 			medium_loopCounter;			// Counters for branching from main control loop to slower loops
diff --git a/ArduPlane/Log.pde b/ArduPlane/Log.pde
index 70ad616c07..ab2df904e7 100644
--- a/ArduPlane/Log.pde
+++ b/ArduPlane/Log.pde
@@ -455,7 +455,7 @@ static void Log_Write_Performance()
 	DataFlash.WriteByte(HEAD_BYTE2);
 	DataFlash.WriteByte(LOG_PERFORMANCE_MSG);
 	DataFlash.WriteLong(millis()- perf_mon_timer);
-	DataFlash.WriteInt(mainLoop_count);
+	DataFlash.WriteInt((int16_t)mainLoop_count);
 	DataFlash.WriteInt(G_Dt_max);
 	DataFlash.WriteByte(dcm.gyro_sat_count);
 	DataFlash.WriteByte(imu.adc_constraints);