diff --git a/client/src/js/services/CashService.js b/client/src/js/services/CashService.js
index f971dad858..2c9b6e9549 100644
--- a/client/src/js/services/CashService.js
+++ b/client/src/js/services/CashService.js
@@ -83,7 +83,8 @@ function CashService(Modal, Api, Exchange, Session, moment, $translate) {
       return invoice.reference;
     });
 
-    var referencesString = invoicesReferences.join(', ');
+    // this must be semicolons, otherwise the CSV file breaks.
+    var referencesString = invoicesReferences.join('; ');
 
     var tmpl = isCaution ? 'CASH.PREPAYMENT_DESCRIPTION' : 'CASH.PAYMENT_DESCRIPTION';