diff --git a/xmlhelp/source/treeview/tvread.cxx b/xmlhelp/source/treeview/tvread.cxx
index 815528fe862a..d2b7e58655b7 100644
--- a/xmlhelp/source/treeview/tvread.cxx
+++ b/xmlhelp/source/treeview/tvread.cxx
@@ -139,7 +139,7 @@ namespace treeview {
                 }
 
                 OUStringBuffer strBuff( 22 + len + id.getLength() );
-                strBuff.appendAscii(
+                strBuff.append(
                                     "vnd.sun.star.help://"
                                     ).append(id);