diff --git a/lualib/skynet/db/mongo.lua b/lualib/skynet/db/mongo.lua
index d51b4d14..958f9673 100644
--- a/lualib/skynet/db/mongo.lua
+++ b/lualib/skynet/db/mongo.lua
@@ -690,7 +690,7 @@ function mongo_cursor:hasNext()
 		else
 			if self.__cursor  and self.__cursor > 0 then
 				local name = self.__collection.name
-				response = database:runCommand("getMore", bson_int64(self.__cursor), "collection", name, "batchSize", self.__limit)
+				response = database:runCommand("getMore", bson_int64(self.__cursor), "collection", name)
 			else
 				-- no more
 				self.__document	= nil
@@ -754,4 +754,4 @@ function mongo_cursor:close()
 	end
 end
 
-return mongo
\ No newline at end of file
+return mongo