diff --git a/IkiWiki/Plugin/aggregate.pm b/IkiWiki/Plugin/aggregate.pm
index 2b40625db..07c557bcd 100644
--- a/IkiWiki/Plugin/aggregate.pm
+++ b/IkiWiki/Plugin/aggregate.pm
@@ -420,11 +420,11 @@ sub expire () { #{{{
 		next unless $feed->{expireage} || $feed->{expirecount};
 		my $count=0;
 		my %seen;
-		foreach my $item (sort { $IkiWiki::pagectime{$b->{page}} <=> $IkiWiki::pagectime{$a->{page}} }
+		foreach my $item (sort { ($IkiWiki::pagectime{$b->{page}} || 0) <=> ($IkiWiki::pagectime{$a->{page}} || 0) }
 		                  grep { exists $_->{page} && $_->{feed} eq $feed->{name} }
 		                  values %guids) {
 			if ($feed->{expireage}) {
-				my $days_old = (time - $IkiWiki::pagectime{$item->{page}}) / 60 / 60 / 24;
+				my $days_old = (time - ($IkiWiki::pagectime{$item->{page}} || 0) / 60 / 60 / 24;
 				if ($days_old > $feed->{expireage}) {
 					debug(sprintf(gettext("expiring %s (%s days old)"),
 						$item->{page}, int($days_old)));
diff --git a/debian/changelog b/debian/changelog
index f3f30dc21..ff119a314 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,6 +1,8 @@
 ikiwiki (2.66) UNRELEASED; urgency=low
 
   * recentchanges: Fix redirects to non-page files. 
+  * aggregate: Avoid uninitialized value warnings for pages with no recorded
+    ctime.
 
  -- Joey Hess <joeyh@debian.org>  Thu, 25 Sep 2008 13:45:55 -0400