diff --git a/lualib/skynet.lua b/lualib/skynet.lua
index 4a101004..97a7f6b9 100644
--- a/lualib/skynet.lua
+++ b/lualib/skynet.lua
@@ -311,7 +311,7 @@ function skynet.starttime()
 end
 
 function skynet.time()
-	return skynet.now()/100 + starttime or skynet.starttime()
+	return skynet.now()/100 + (starttime or skynet.starttime())
 end
 
 function skynet.exit()