diff --git a/examples/cluster1.lua b/examples/cluster1.lua
index 551b0f38..6bb3b68d 100644
--- a/examples/cluster1.lua
+++ b/examples/cluster1.lua
@@ -2,8 +2,9 @@ local skynet = require "skynet"
 local cluster = require "cluster"
 
 skynet.start(function()
-	skynet.newservice("simpledb")
-	print(skynet.call("SIMPLEDB", "lua", "SET", "a", "foobar"))
-	print(skynet.call("SIMPLEDB", "lua", "GET", "a"))
+	local sdb = skynet.newservice("simpledb")
+	skynet.name(".simpledb", sdb)
+	print(skynet.call(".simpledb", "lua", "SET", "a", "foobar"))
+	print(skynet.call(".simpledb", "lua", "GET", "a"))
 	cluster.open "db"
 end)
diff --git a/examples/simpledb.lua b/examples/simpledb.lua
index e70d2f86..3a7649e6 100644
--- a/examples/simpledb.lua
+++ b/examples/simpledb.lua
@@ -22,6 +22,5 @@ skynet.start(function()
 			error(string.format("Unknown command %s", tostring(cmd)))
 		end
 	end)
-	skynet.register ".simpledb"
 	skynet.register "SIMPLEDB"
 end)