diff --git a/strategies/trend-follow/BollingerBandTrendFollow/scripts/BollingerBandTrendFollowStrategy.cs b/strategies/trend-follow/BollingerBandTrendFollow/scripts/BollingerBandTrendFollowStrategy.cs
index daa1c65..598322e 100644
--- a/strategies/trend-follow/BollingerBandTrendFollow/scripts/BollingerBandTrendFollowStrategy.cs
+++ b/strategies/trend-follow/BollingerBandTrendFollow/scripts/BollingerBandTrendFollowStrategy.cs
@@ -57,8 +57,8 @@ protected override void OnBarClosed()
             double stdLastValue = Indicators.StandardDeviation(Bars.ClosePrices, Length, MovingAverageType.Simple).Result.LastValue;
             double smaLastValue = Indicators.SimpleMovingAverage(Bars.ClosePrices, Length).Result.LastValue;
             
-            double upperBand = smaLastValue + MultiplierUpper * stdLastValue;
-            double lowerBand = smaLastValue + MultiplierLower * stdLastValue;  
+            double upperBand = smaLastValue + (MultiplierUpper * stdLastValue);
+            double lowerBand = smaLastValue - (MultiplierLower * stdLastValue);  
             
             string label = $"BollingerBandTrendFollow_cBot-{Symbol.Name}";
              
@@ -97,4 +97,4 @@ protected override void OnBarClosed()
             }
         }
     }
-}
\ No newline at end of file
+}