No item named "double_stone_slab"

I needed some full stone slabs, so I typed "/give tbh1138 minecraft:double_stone_slab 64 8" to get a stack of them. Instead, I got the following error message: "There is no item with name minecraft:double_stone_slab" This is the name given on the wiki, and I have been able to /give myself other blocks, so what's going on?