diff --git a/apps/api/src/app/portfolio/calculator/portfolio-calculator.ts b/apps/api/src/app/portfolio/calculator/portfolio-calculator.ts
index 807566217..8a8606003 100644
--- a/apps/api/src/app/portfolio/calculator/portfolio-calculator.ts
+++ b/apps/api/src/app/portfolio/calculator/portfolio-calculator.ts
@@ -922,7 +922,7 @@ export abstract class PortfolioCalculator {
       if (oldAccumulatedSymbol) {
         let investment = oldAccumulatedSymbol.investment;
 
-        const newQuantity = quantity
+        let newQuantity = quantity
           .mul(factor)
           .plus(oldAccumulatedSymbol.quantity);
 
@@ -948,9 +948,10 @@ export abstract class PortfolioCalculator {
           }
         }
 
-        // Reset to zero if quantity is (almost) zero to avoid rounding issues
         if (newQuantity.abs().lt(Number.EPSILON)) {
+          // Reset to zero if quantity is (almost) zero to avoid rounding issues
           investment = new Big(0);
+          newQuantity = new Big(0);
         }
 
         currentTransactionPointItem = {