diff --git a/IkiWiki/Plugin/websetup.pm b/IkiWiki/Plugin/websetup.pm
index 11b4428e3..2674b91e8 100644
--- a/IkiWiki/Plugin/websetup.pm
+++ b/IkiWiki/Plugin/websetup.pm
@@ -295,6 +295,7 @@ sub showform ($$) {
 	$form->field(name => "do", type => "hidden", value => "setup",
 		force => 1);
 	$form->field(name => "rebuild_asked", type => "hidden");
+	$form->field(name => "showadvanced", type => "hidden");
 
 	if ($form->submitted eq 'Basic Mode') {
 		$form->field(name => "showadvanced", type => "hidden", 
diff --git a/debian/changelog b/debian/changelog
index 53bee5df6..fb012abd2 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -10,6 +10,7 @@ ikiwiki (3.20100927) UNRELEASED; urgency=low
   * Thanks to Peter Gammie for his assistance with the web-based reversion
     feature.
   * actiontabs: More consistent styling of Hn tags.
+  * websetup: Fix saving of advanced mode changes.
 
  -- Joey Hess <joeyh@debian.org>  Wed, 29 Sep 2010 11:58:23 -0400