diff --git a/lualib/skynet/remotedebug.lua b/lualib/skynet/remotedebug.lua
index 338cbff8..8b7c89e3 100644
--- a/lualib/skynet/remotedebug.lua
+++ b/lualib/skynet/remotedebug.lua
@@ -194,6 +194,7 @@ local function hook_dispatch(dispatcher, resp, fd, channel)
 
 	local function watch_cmd(cmd)
 		local co = next(ctx_active)
+		watch_env._CO = co
 		if dbgcmd[cmd] then
 			dbgcmd[cmd](co)
 		else