diff --git a/include/XMLDocument/invoiceubl21.class.php b/include/XMLDocument/invoiceubl21.class.php
index ee4f1cd0e..d0d19fad1 100644
--- a/include/XMLDocument/invoiceubl21.class.php
+++ b/include/XMLDocument/invoiceubl21.class.php
@@ -491,7 +491,7 @@ class InvoiceUBL21 extends XMLInvoice {
         $item->appendChild($classifiedTaxCat);
         $result->appendChild($item);
         $price=$result->appendChild($this->createElement("cac:Price"));
-        $price->appendChild($this->createElement("cbc:PriceAmount",sprintf("%.2f",abs($row['price_unit']))))
+        $price->appendChild($this->createElement("cbc:PriceAmount",sprintf("%.4f",abs($row['price_unit']))))
                 ->setAttribute("currencyID",$this->data['currency']);
         $result->appendChild($price);