diff --git a/templates/pdf/default2020/invoice.html b/templates/pdf/default2020/invoice.html
index b7f71381..3ed3c744 100644
--- a/templates/pdf/default2020/invoice.html
+++ b/templates/pdf/default2020/invoice.html
@@ -184,7 +184,7 @@
             <td><h3>{intl l="Invoice date"} : <span>{format_date date=$INVOICE_DATE output="date"}</span></h3></td>
         </tr>
         <tr>
-            <td><h3>{intl l="Invoice REF"} : <span>{$REF}</span></h3></td>
+            <td><h3>{intl l="Invoice REF"} : <span>{if $INVOICE_REF == null}{$REF}{else}{$INVOICE_REF}{/if}</span></h3></td>
         </tr>
         <tr>
             <td><h3>{intl l="Customer Number"} : <span>{loop type="customer" name="customer.invoice" id=$CUSTOMER current="0"}{$REF}{/loop}</span></h3></td>