diff --git a/src/client/stores/CalculationStore/Effects/lib/prepareData.ts b/src/client/stores/CalculationStore/Effects/lib/prepareData.ts
index 0ef39c1..c426ba8 100644
--- a/src/client/stores/CalculationStore/Effects/lib/prepareData.ts
+++ b/src/client/stores/CalculationStore/Effects/lib/prepareData.ts
@@ -163,7 +163,7 @@ export default ({
     (preparedValues.insuranceOsago || 0) + (preparedValues.insuranceKasko || 0);
 
   preparedValues.insuranceKaskoNmper =
-    preparedValues.nmperInsurance || 0 >= 16
+    (preparedValues.nmperInsurance || 0) >= 16
       ? (preparedValues.insuranceKasko ||
           0 * (preparedValues.nmperInsurance || 0)) / 12
       : preparedValues.insuranceKasko;