Fix warning
Fix warning

lpsinger/astropy,kelle/astropy,larrybradley/astropy,bsipocz/astropy,joergdietrich/astropy,stargaser/astropy,stargaser/astropy,aleksandr-bakanov/astropy,dhomeier/astropy,lpsinger/astropy,AustereCuriosity/astropy,larrybradley/astropy,AustereCuriosity/astropy,tbabej/astropy,tbabej/astropy,joergdietrich/astropy,bsipocz/astropy,astropy/astropy,tbabej/astropy,larrybradley/astropy,pllim/astropy,mhvk/astropy,DougBurke/astropy,astropy/astropy,dhomeier/astropy,StuartLittlefair/astropy,pllim/astropy,joergdietrich/astropy,funbaker/astropy,MSeifert04/astropy,joergdietrich/astropy,dhomeier/astropy,stargaser/astropy,astropy/astropy,DougBurke/astropy,funbaker/astropy,kelle/astropy,bsipocz/astropy,larrybradley/astropy,stargaser/astropy,MSeifert04/astropy,lpsinger/astropy,StuartLittlefair/astropy,saimn/astropy,tbabej/astropy,StuartLittlefair/astropy,kelle/astropy,StuartLittlefair/astropy,lpsinger/astropy,pllim/astropy,aleksandr-bakanov/astropy,mhvk/astropy,saimn/astropy,AustereCuriosity/astropy,joergdietrich/astropy,pllim/astropy,DougBurke/astropy,StuartLittlefair/astropy,aleksandr-bakanov/astropy,saimn/astropy,MSeifert04/astropy,dhomeier/astropy,funbaker/astropy,dhomeier/astropy,saimn/astropy,funbaker/astropy,aleksandr-bakanov/astropy,saimn/astropy,mhvk/astropy,larrybradley/astropy,AustereCuriosity/astropy,astropy/astropy,tbabej/astropy,mhvk/astropy,MSeifert04/astropy,pllim/astropy,AustereCuriosity/astropy,kelle/astropy,DougBurke/astropy,bsipocz/astropy,mhvk/astropy,astropy/astropy,kelle/astropy,lpsinger/astropy