diff --git a/ulask.php b/ulask.php
index 5099718564..de28452f0e 100644
--- a/ulask.php
+++ b/ulask.php
@@ -576,12 +576,16 @@ function hae_skannattu_lasku($kasittele_seuraava = "") {
     }
   }
 
+  if ($kassaale != 0) {
+    $kassaale = str_replace(",", ".", trim($kassaale));
+  }
   if ($kapro != 0) {
     if ($kassaale > 0) {
       $errormsg .= "<font class='error'>".t("Kaksi kassa-alesummaa")."</font><br>";
       $tee = 'E';
     }
     else {
+      $kapro = str_replace(",", ".", trim($kapro));
       $kassaale = $summa * $kapro / 100;
       $kapro = 0;
     }