diff --git a/IkiWiki/Wrapper.pm b/IkiWiki/Wrapper.pm
index 52a7ca2c7..7d27abd06 100644
--- a/IkiWiki/Wrapper.pm
+++ b/IkiWiki/Wrapper.pm
@@ -47,6 +47,10 @@ EOF
 EOF
 	}
 	
+	# This is only set by plugins, which append to it on startup, so
+	# avoid storing it in the wrapper.
+	$config{headercontent}="";
+	
 	$Data::Dumper::Indent=0; # no newlines
 	my $configstring=Data::Dumper->Dump([\%config], ['*config']);
 	$configstring=~s/\\/\\\\/g;