diff --git a/app/src/main/assets/OpenAPSSMBDynamicISF/determine-basal.js b/app/src/main/assets/OpenAPSSMBDynamicISF/determine-basal.js
index 74f442bbf1..5066bd1cac 100644
--- a/app/src/main/assets/OpenAPSSMBDynamicISF/determine-basal.js
+++ b/app/src/main/assets/OpenAPSSMBDynamicISF/determine-basal.js
@@ -580,11 +580,13 @@ var determine_basal = function determine_basal(glucose_status, currenttemp, iob_
             // over 60 minutes (data points every 5m)
             var predDev = ci * ( 1 - Math.min(1,IOBpredBGs.length/(60/5)) );
             //IOBpredBG = IOBpredBGs[IOBpredBGs.length-1] + predBGI + predDev;
-             IOBpredBG = IOBpredBGs[IOBpredBGs.length-1] + (round(( -iobTick.activity * (1800 / ( TDD * (Math.log((Math.max( IOBpredBGs[IOBpredBGs.length-1],39) / ins_val ) + 1 ) ) )) * 5 ),2))
+             IOBpredBG = IOBpredBGs[IOBpredBGs.length-1] + (round(( -iobTick.activity * (1800 / ( TDD * (Math.log((Math.max( IOBpredBGs[IOBpredBGs.length-1],39) / insulinDivisor ) + 1 ) ) ))
+             * 5 ),2))
 
             // calculate predBGs with long zero temp without deviations
             //var ZTpredBG = ZTpredBGs[ZTpredBGs.length-1] + predZTBGI;
-            var ZTpredBG = ZTpredBGs[ZTpredBGs.length-1] + (round(( -iobTick.iobWithZeroTemp.activity * (1800 / ( TDD * (Math.log(( Math.max(ZTpredBGs[ZTpredBGs.length-1],39) / ins_val ) + 1 ) ) )) * 5 ), 2));
+            var ZTpredBG = ZTpredBGs[ZTpredBGs.length-1] + (round(( -iobTick.iobWithZeroTemp.activity * (1800 / ( TDD * (Math.log(( Math.max(ZTpredBGs[ZTpredBGs.length-1],39) /
+            insulinDivisor ) + 1 ) ) )) * 5 ), 2));
             // for COBpredBGs, predicted carb impact drops linearly from current carb impact down to zero
             // eventually accounting for all carbs (if they can be absorbed over DIA)
             var predCI = Math.max(0, Math.max(0,ci) * ( 1 - COBpredBGs.length/Math.max(cid*2,1) ) );
@@ -614,7 +616,8 @@ var determine_basal = function determine_basal(glucose_status, currenttemp, iob_
                 UAMduration=round((UAMpredBGs.length+1)*5/60,1);
             }
             //UAMpredBG = UAMpredBGs[UAMpredBGs.length-1] + predBGI + Math.min(0, predDev) + predUCI;
-            UAMpredBG = UAMpredBGs[UAMpredBGs.length-1] + (round(( -iobTick.activity * (1800 / ( TDD * (Math.log(( Math.max(UAMpredBGs[UAMpredBGs.length-1],39) / ins_val ) + 1 ) ) )) * 5 ),2)) + Math.min(0, predDev) + predUCI;
+            UAMpredBG = UAMpredBGs[UAMpredBGs.length-1] + (round(( -iobTick.activity * (1800 / ( TDD
+             * (Math.log(( Math.max(UAMpredBGs[UAMpredBGs.length-1],39) / insulinDivisor ) + 1 ) ) )) * 5 ),2)) + Math.min(0, predDev) + predUCI;
             //console.error(predBGI, predCI, predUCI);
             // truncate all BG predictions at 4 hours
             if ( IOBpredBGs.length < 48) { IOBpredBGs.push(IOBpredBG); }