@e[r=Radius,type=Fireball] Not working

Hey guys, i`m trying to use the @e[type=Fireball,r=2] in a execute command to tp the player hitted by the fireball to a place. But the r= isnt working. I hooked up the command block to a fill clock.
If i remove the radius tag and spawn a fireball i will get the tp to work. I`m in 14w11b.