diff --git a/CRM/Contact/Page/AJAX.php b/CRM/Contact/Page/AJAX.php
index 7f3e4412acf0..be78f303a9d7 100644
--- a/CRM/Contact/Page/AJAX.php
+++ b/CRM/Contact/Page/AJAX.php
@@ -862,7 +862,7 @@ public static function markNonDuplicates($cid, $oid, $oper) {
   /**
    * Retrieve a PDF Page Format for the PDF Letter form.
    */
-  public function pdfFormat() {
+  public static function pdfFormat() {
     $formatId = CRM_Utils_Type::escape($_REQUEST['formatId'], 'Integer');
 
     $pdfFormat = CRM_Core_BAO_PdfFormat::getById($formatId);