diff --git a/debian/lighttpd/89-dump1090-fa.conf b/debian/lighttpd/89-dump1090-fa.conf
index 5bb37af..baf6524 100644
--- a/debian/lighttpd/89-dump1090-fa.conf
+++ b/debian/lighttpd/89-dump1090-fa.conf
@@ -41,7 +41,7 @@ $SERVER["socket"] == ":8080" {
 # Add CORS header
 server.modules += ( "mod_setenv" )
 $HTTP["url"] =~ "^/dump1090-fa/data/.*\.json$" {
-  setenv.add-response-header = ( "Access-Control-Allow-Origin" => "*" )
+  setenv.set-response-header = ( "Access-Control-Allow-Origin" => "*" )
 }
 
 # Uncomment this section to enable SSL traffic (HTTPS) - especially useful