diff --git a/service/debug_console.lua b/service/debug_console.lua
index 2db38e46..ec4ea482 100644
--- a/service/debug_console.lua
+++ b/service/debug_console.lua
@@ -269,7 +269,7 @@ function COMMANDX.debug(cmd)
 	local function forward_cmd()
 		repeat
 			-- notice :  It's a bad practice to call socket.readline from two threads (this one and console_main_loop), be careful.
-			skynet.call(agent, "lua", "cmd", "ping")	-- detect agent alive, if agent exit, raise error
+			skynet.call(agent, "lua", "ping")	-- detect agent alive, if agent exit, raise error
 			local cmdline = socket.readline(cmd.fd, "\n")
 			cmdline = cmdline and cmdline:gsub("(.*)\r$", "%1")
 			if not cmdline then