Fix compilation on GCC 4.9
Fix compilation on GCC 4.9

haojin2/peloton,haojin2/peloton,yingjunwu/peloton,cmu-db/peloton,cmu-db/peloton,vittvolt/peloton,seojungmin/peloton,apavlo/peloton,cmu-db/peloton,vittvolt/peloton,PauloAmora/peloton,malin1993ml/peloton,apavlo/peloton,haojin2/peloton,yingjunwu/peloton,malin1993ml/peloton,seojungmin/peloton,cmu-db/peloton,yingjunwu/peloton,PauloAmora/peloton,vittvolt/peloton,yingjunwu/peloton,haojin2/peloton,PauloAmora/peloton,cmu-db/peloton,apavlo/peloton,seojungmin/peloton,seojungmin/peloton,cmu-db/peloton,yingjunwu/peloton,malin1993ml/peloton,vittvolt/peloton,apavlo/peloton,PauloAmora/peloton,vittvolt/peloton,haojin2/peloton,PauloAmora/peloton,vittvolt/peloton,apavlo/peloton,seojungmin/peloton,PauloAmora/peloton,malin1993ml/peloton,seojungmin/peloton,haojin2/peloton,apavlo/peloton,malin1993ml/peloton,malin1993ml/peloton,yingjunwu/peloton