fix compilation problem
fix compilation problem

bcambel/oss.io,bcambel/hackersome,bcambel/hackersome,meizhoubao/hackersome,meizhoubao/hackersome,bcambel/hackersome,bcambel/oss.io,meizhoubao/hackersome,bcambel/oss.io,bcambel/hackersome,bcambel/oss.io,meizhoubao/hackersome