diff --git a/application/HistoricBill/HistoricBillModel.php b/application/HistoricBill/HistoricBillModel.php
index 179bc8de5..1c93bdb49 100644
--- a/application/HistoricBill/HistoricBillModel.php
+++ b/application/HistoricBill/HistoricBillModel.php
@@ -14,7 +14,7 @@ class HistoricBillModel extends TTCrudBaseModel {
     public string $accountnumber;
     public string $BIC;
     public string $IBAN;
-    public int $brutto_sum;
+    public float $brutto_sum;
     public ?string $fibu_number;
     public string $Mandatinvoice_number;
     public int $payment;