Index: firmware/App/Controllers/BloodFlow.c
===================================================================
diff -u -r29e57b5232f605a871c62580e16a7db297aae992 -r0d8381c50f7189c4cfbc2794a4aedf297eea7d15
--- firmware/App/Controllers/BloodFlow.c	(.../BloodFlow.c)	(revision 29e57b5232f605a871c62580e16a7db297aae992)
+++ firmware/App/Controllers/BloodFlow.c	(.../BloodFlow.c)	(revision 0d8381c50f7189c4cfbc2794a4aedf297eea7d15)
@@ -907,9 +907,9 @@
     {
         U16 bpMotorHallSensorCount = getFPGABloodPumpHallSensorCount();
         U32 nextIdx = INC_WRAP( bpMotorSpeedCalcIdx, 0, BP_SPEED_CALC_BUFFER__LEN - 1 );
-        U16 incDelta = ( bpMotorHallSensorCount >= bpLastMotorHallSensorCounts[ bpMotorSpeedCalcIdx ] ? \
-                         bpMotorHallSensorCount - bpLastMotorHallSensorCounts[ bpMotorSpeedCalcIdx ] : \
-                         ( HEX_64_K - bpLastMotorHallSensorCounts[ bpMotorSpeedCalcIdx ] ) + bpMotorHallSensorCount );
+        U16 incDelta = ( bpMotorHallSensorCount >= bpLastMotorHallSensorCounts[ nextIdx ] ? \
+                         bpMotorHallSensorCount - bpLastMotorHallSensorCounts[ nextIdx ] : \
+                         ( HEX_64_K - bpLastMotorHallSensorCounts[ nextIdx ] ) + bpMotorHallSensorCount );
         U16 decDelta = HEX_64_K - incDelta;
         U16 delta;