diff --git a/htdocs/takepos/ajax/ajax.php b/htdocs/takepos/ajax/ajax.php
index 73905831ee5..9f3856a703f 100644
--- a/htdocs/takepos/ajax/ajax.php
+++ b/htdocs/takepos/ajax/ajax.php
@@ -396,6 +396,8 @@ if ($action == 'getProducts') {
 		echo 'Failed to search product : '.$db->lasterror();
 	}
 } elseif ($action == "opendrawer" && $term != '') {
+	top_httphead('application/html');
+
 	require_once DOL_DOCUMENT_ROOT.'/core/class/dolreceiptprinter.class.php';
 	$printer = new dolReceiptPrinter($db);
 	// check printer for terminal
@@ -406,6 +408,8 @@ if ($action == 'getProducts') {
 		$printer->close();
 	}
 } elseif ($action == "printinvoiceticket" && $term != '' && $id > 0 && $user->hasRight('facture', 'lire')) {
+	top_httphead('application/html');
+
 	require_once DOL_DOCUMENT_ROOT.'/core/class/dolreceiptprinter.class.php';
 	require_once DOL_DOCUMENT_ROOT.'/compta/facture/class/facture.class.php';
 	$printer = new dolReceiptPrinter($db);
@@ -427,6 +431,8 @@ if ($action == 'getProducts') {
 
 	echo json_encode($object);
 } elseif ($action == 'thecheck') {
+	top_httphead('application/html');
+
 	$place = GETPOST('place', 'alpha');
 	require_once DOL_DOCUMENT_ROOT.'/compta/facture/class/facture.class.php';
 	require_once DOL_DOCUMENT_ROOT.'/core/class/dolreceiptprinter.class.php';
diff --git a/htdocs/takepos/invoice.php b/htdocs/takepos/invoice.php
index 7afd29f7bf2..220fe3bf3b3 100644
--- a/htdocs/takepos/invoice.php
+++ b/htdocs/takepos/invoice.php
@@ -1287,12 +1287,15 @@ function TakeposConnector(id){
 	return true;
 }
 
+// Call the ajax to execute the print.
+// With some external module another method may be called.
 function DolibarrTakeposPrinting(id) {
-	console.log("DolibarrTakeposPrinting Printing invoice ticket " + id)
+	console.log("DolibarrTakeposPrinting Printing invoice ticket " + id);
 	$.ajax({
 		type: "GET",
 		data: { token: '<?php echo currentToken(); ?>' },
 		url: "<?php print DOL_URL_ROOT.'/takepos/ajax/ajax.php?action=printinvoiceticket&token='.newToken().'&term='.urlencode(isset($_SESSION["takeposterminal"]) ? $_SESSION["takeposterminal"] : '').'&id='; ?>" + id,
+
 	});
 	return true;
 }