diff --git a/tailbone/templates/themes/waterpark/master/index.mako b/tailbone/templates/themes/waterpark/master/index.mako
index e3b5b42d..e6702599 100644
--- a/tailbone/templates/themes/waterpark/master/index.mako
+++ b/tailbone/templates/themes/waterpark/master/index.mako
@@ -254,6 +254,11 @@
 
 </%def>
 
+## DEPRECATED; remains for back-compat
+<%def name="render_this_page()">
+  ${self.page_content()}
+</%def>
+
 <%def name="render_vue_template_grid()">
   ${grid.render_vue_template(tools=capture(self.grid_tools).strip(), context_menu=capture(self.context_menu_items).strip())}
 </%def>