Configuration Error with mod_dirlisting

[anonymous]

index-file.names = ( "index.xhtml", "index.html", 
"/cgi-bin/dir-generator" )
server.dir-listing = "enable"
scgi.server = (
	"/cgi-bin" =>
		(
			(
			"socket" =>
				"/path/.scgi-sock"
			"check-local" => "disable"
			[removed for brevity]
			)
		)
	)

It seems that whenever lighttpd gets a request for a directory without an index file (index.xhtml or index.html), then it should call the scgi server to get the directory listing. It does not. I suppose I could accomplish this with rewrite-rules, but i'm concerned that this may be an unintended bug.