diff --git a/src/dhcp/server.coffee b/src/dhcp/server.coffee
index 07f44db..197363b 100644
--- a/src/dhcp/server.coffee
+++ b/src/dhcp/server.coffee
@@ -23,7 +23,7 @@ class Server extends EventEmitter
     new Server(opt)
 
   constructor: (config) ->
-    super
+    super()
 
     sock = dgram.createSocket
       type: 'udp4'