diff --git a/src/main/java/com/pfefferminzia/petinsurance/calculations/Calculations.java b/src/main/java/com/pfefferminzia/petinsurance/calculations/Calculations.java
index 05b6116..a6db6c3 100644
--- a/src/main/java/com/pfefferminzia/petinsurance/calculations/Calculations.java
+++ b/src/main/java/com/pfefferminzia/petinsurance/calculations/Calculations.java
@@ -30,7 +30,7 @@ public class Calculations {
 
         BigDecimal insuranceSum = getInsuranceSum(baseInsuranceSum, tariff.factor());
 
-        BigDecimal ageFactor = ageFactorLookup(contract.animal().birthday(), insuranceStartDate);
+        BigDecimal ageFactor = ageFactorLookup(animal.birthday(), insuranceStartDate);
 
         BigDecimal breedPremiumAdjustment = breedFactorLookup(animal);