diff --git a/tutorial/html.pike b/tutorial/html.pike
index 1a595b23180f5a27978f09f3e36a2f1a4e12ed0d..646708a5ebff1e97f8300be65375e3787f8cf9c8 100644
--- a/tutorial/html.pike
+++ b/tutorial/html.pike
@@ -857,7 +857,8 @@ SGML convert(SGML data)
 			   "Appendix ",
 			   data->params->number,
 			   ", ",
-			   data->params->title||error("Appendix without title"),
+			   data->params->title||
+			   lambda(){error("Appendix without title");}(),
 			})),
 	       "\n"
 	    })+