fix issue spotted by oit on github.
fix issue spotted by oit on github.

1stvamp/gunicorn,WSDC-NITWarangal/gunicorn,ephes/gunicorn,elelianghh/gunicorn,prezi/gunicorn,1stvamp/gunicorn,alex/gunicorn,harrisonfeng/gunicorn,jamesblunt/gunicorn,1stvamp/gunicorn,z-fork/gunicorn,alex/gunicorn,tempbottle/gunicorn,ccl0326/gunicorn,urbaniak/gunicorn,pschanely/gunicorn,beni55/gunicorn,MrKiven/gunicorn,pschanely/gunicorn,malept/gunicorn,mvaled/gunicorn,zhoucen/gunicorn,pschanely/gunicorn,prezi/gunicorn,malept/gunicorn,gtrdotmcs/gunicorn,GitHublong/gunicorn,zhoucen/gunicorn,wong2/gunicorn,keakon/gunicorn,ccl0326/gunicorn,prezi/gunicorn,jamesblunt/gunicorn,wong2/gunicorn,wong2/gunicorn,mvaled/gunicorn,urbaniak/gunicorn,mvaled/gunicorn,ccl0326/gunicorn,ammaraskar/gunicorn,gtrdotmcs/gunicorn,zhoucen/gunicorn,alex/gunicorn,malept/gunicorn,jamesblunt/gunicorn,urbaniak/gunicorn,gtrdotmcs/gunicorn,tejasmanohar/gunicorn