diff --git a/service/service_mgr.lua b/service/service_mgr.lua
index f49a79f7..db9499d4 100644
--- a/service/service_mgr.lua
+++ b/service/service_mgr.lua
@@ -176,7 +176,7 @@ skynet.start(function()
 		end
 	end)
 	local handle = skynet.localname ".service"
-	if  handle ~= 0 then
+	if  handle then
 		skynet.error(".service is already register by ", skynet.address(handle))
 		skynet.exit()
 	else