diff --git a/ext/socket/lib/socket.rb b/ext/socket/lib/socket.rb
index ad7d1e7aa0ff4a..d079ec508eacab 100644
--- a/ext/socket/lib/socket.rb
+++ b/ext/socket/lib/socket.rb
@@ -897,6 +897,7 @@ def self.udp_server_sockets(host=nil, port)
         ip_list << ai
       end
     }
+    ip_list.uniq!{|e| e.to_sockaddr}
 
     if port == 0
       sockets = ip_sockets_port0(ip_list, false)