diff --git a/ReportImp/PraxisPusteblume/Invoicing/IFSSammelInvoiceCreation.cs b/ReportImp/PraxisPusteblume/Invoicing/IFSSammelInvoiceCreation.cs
index d93460763..1a030035c 100644
--- a/ReportImp/PraxisPusteblume/Invoicing/IFSSammelInvoiceCreation.cs
+++ b/ReportImp/PraxisPusteblume/Invoicing/IFSSammelInvoiceCreation.cs
@@ -145,7 +145,7 @@ namespace PraxisPusteblume.Invoicing
 
                         while (anzahl <= 5)
                         {
-                            vernetzung.Add(monat);
+                            vernetzung.Add(monat++);
                             anzahl++;
                         }