diff --git a/lualib/skynet.lua b/lualib/skynet.lua
index 4cbb69fb..73055d44 100644
--- a/lualib/skynet.lua
+++ b/lualib/skynet.lua
@@ -127,6 +127,7 @@ local function co_create(f)
 				local address = session_coroutine_address[co]
 				if address then
 					session_coroutine_id[co] = nil
+					session_coroutine_address[co] = nil
 				end
 
 				-- recycle co into pool