diff --git a/functions/pdf.xml b/functions/pdf.xml
index b5aeaa3519..59173ea280 100644
--- a/functions/pdf.xml
+++ b/functions/pdf.xml
@@ -717,7 +717,7 @@ fclose($fp);
      <paramdef>int <parameter>pdf document</parameter></paramdef>
      <paramdef>string <parameter>font name</parameter></paramdef>
      <paramdef>double <parameter>size</parameter></paramdef>
-     <paramdef>int <parameter>encoding</parameter></paramdef>
+     <paramdef>string <parameter>encoding</parameter></paramdef>
      <paramdef>int <parameter><optional>embed</optional></parameter></paramdef>
     </funcsynopsis>
     <para>