diff --git a/EvoCalculator.Core.Calculation/v3/Columns/FinGAPNmperGrColumn.cs b/EvoCalculator.Core.Calculation/v3/Columns/FinGAPNmperGrColumn.cs
index 0a86f5c..1f8fc2e 100644
--- a/EvoCalculator.Core.Calculation/v3/Columns/FinGAPNmperGrColumn.cs
+++ b/EvoCalculator.Core.Calculation/v3/Columns/FinGAPNmperGrColumn.cs
@@ -31,7 +31,7 @@ public class FinGAPNmperGrColumn : BaseColumnWithSum
         else
         {
             var InsuranceFinGAPMonth = preparedValues.InsuranceFinGAP / 12;
-            for (var i = 1; i < preparedValues.NmperFinGAP; i += 12)
+            for (var i = 1; i < preparedValues.NmperFinGAP + 1; i += 12)
                 if (i <= preparedValues.NmperFinGAP)
                     Values[i] = preparedValues.NmperFinGAP - i + 1 >= 12
                         ? InsuranceFinGAPMonth * 12