diff --git a/examples/cluster1.lua b/examples/cluster1.lua
index 10b2e2f2..921453d8 100644
--- a/examples/cluster1.lua
+++ b/examples/cluster1.lua
@@ -19,8 +19,8 @@ skynet.start(function()
 	print(skynet.call(sdb, "lua", "SET", "b", "foobar2"))
 	print(skynet.call(sdb, "lua", "GET", "a"))
 	print(skynet.call(sdb, "lua", "GET", "b"))
-	cluster.open "db"
-	cluster.open "db2"
+	skynet.error("Open db", cluster.open "db")
+	skynet.error("Open db2", cluster.open "db2")
 	-- unique snax service
 	snax.uniqueservice "pingserver"
 end)
diff --git a/lualib/skynet/cluster.lua b/lualib/skynet/cluster.lua
index 8118c2f6..e3437b43 100644
--- a/lualib/skynet/cluster.lua
+++ b/lualib/skynet/cluster.lua
@@ -77,9 +77,9 @@ end
 
 function cluster.open(port)
 	if type(port) == "string" then
-		skynet.call(clusterd, "lua", "listen", port)
+		return skynet.call(clusterd, "lua", "listen", port)
 	else
-		skynet.call(clusterd, "lua", "listen", "0.0.0.0", port)
+		return skynet.call(clusterd, "lua", "listen", "0.0.0.0", port)
 	end
 end
 
diff --git a/service/clusterd.lua b/service/clusterd.lua
index d9f61cd4..440cb865 100644
--- a/service/clusterd.lua
+++ b/service/clusterd.lua
@@ -148,8 +148,8 @@ function command.listen(source, addr, port)
 		local address = assert(node_address[addr], addr .. " is down")
 		addr, port = string.match(address, "([^:]+):(.*)$")
 	end
-	skynet.call(gate, "lua", "open", { address = addr, port = port })
-	skynet.ret(skynet.pack(nil))
+	local addr, port = skynet.call(gate, "lua", "open", { address = addr, port = port })
+	skynet.ret(skynet.pack(addr, port))
 end
 
 function command.sender(source, node)