diff --git a/tipi_payment_plugin/templates/tipi_payment_plugin/tipi.html b/tipi_payment_plugin/templates/tipi_payment_plugin/tipi.html
index 3dab32e..a0fe057 100644
--- a/tipi_payment_plugin/templates/tipi_payment_plugin/tipi.html
+++ b/tipi_payment_plugin/templates/tipi_payment_plugin/tipi.html
@@ -71,7 +71,7 @@ function call_tipi() {
                 document.getElementById(value + '_error').style.display='inline';
                 return false;
             }
-            return (parseInt(euros) + parseInt(cents)/100) * 100;
+            return parseInt(euros) * 100 + parseInt(cents);
         }
         document.getElementById(id + '_error').style.display='inline';
         return false;