diff --git a/service/agent.lua b/service/agent.lua
index e51e0d04..8e606313 100644
--- a/service/agent.lua
+++ b/service/agent.lua
@@ -3,7 +3,7 @@ local client = ...
 
 skynet.register_protocol {
 	name = "client",
-	id = 3,
+	id = skynet.PTYPE_CLIENT,
 	pack = function(...) return ... end,
 	unpack = skynet.tostring,
 	dispatch = function (session, address, text)
diff --git a/service/testconnection.lua b/service/testconnection.lua
index d5bd87f8..82dc8164 100644
--- a/service/testconnection.lua
+++ b/service/testconnection.lua
@@ -13,7 +13,7 @@ end
 
 skynet.register_protocol {
 	name = "client",
-	id = 3,
+	id = skynet.PTYPE_CLIENT,
 	pack = function(...) return ... end,
 	unpack = function(msg,sz)
 		if sz == 0 then
diff --git a/service/watchdog.lua b/service/watchdog.lua
index 674cb981..c15f3299 100644
--- a/service/watchdog.lua
+++ b/service/watchdog.lua
@@ -37,7 +37,7 @@ end
 
 skynet.register_protocol {
 	name = "client",
-	id = 3,
+	id = skynet.PTYPE_CLIENT,
 }
 
 skynet.start(function()