Index: firmware/App/Controllers/DialOutFlow.c
===================================================================
diff -u -r93a439cf9d1b347e23b84d1156417380ee01efaa -rc9cb494c004e390155ce7c8b3cda96cf8c1b5fa7
--- firmware/App/Controllers/DialOutFlow.c	(.../DialOutFlow.c)	(revision 93a439cf9d1b347e23b84d1156417380ee01efaa)
+++ firmware/App/Controllers/DialOutFlow.c	(.../DialOutFlow.c)	(revision c9cb494c004e390155ce7c8b3cda96cf8c1b5fa7)
@@ -749,8 +749,8 @@
     if ( ++dopMotorSpeedCalcTimerCtr >= DOP_SPEED_CALC_INTERVAL )
     {
         U16 dopMotorHallSensorCount = getFPGADialOutPumpHallSensorCount();
-        U16 incDelta = ( dopMotorHallSensorCount >= dopLastMotorHallSensorCount ? dopMotorHallSensorCount - dopLastMotorHallSensorCount : ( 0x10000 - dopLastMotorHallSensorCount ) + dopMotorHallSensorCount );
-        U16 decDelta = 0x10000 - incDelta;
+        U16 incDelta = ( dopMotorHallSensorCount >= dopLastMotorHallSensorCount ? dopMotorHallSensorCount - dopLastMotorHallSensorCount : ( HEX_64_K - dopLastMotorHallSensorCount ) + dopMotorHallSensorCount );
+        U16 decDelta = HEX_64_K - incDelta;
         U16 delta;
 
         // determine dialysate outlet pump speed/direction from delta hall sensor count since last interval