Resizing an already completed Armature

I added bones to a character and animated them walking in a scene. I have another scene where the same character is walking the same way. The only difference is that the character needs to be a little smaller. I tried copying and pasting the armature into the scene and then resizing it using the free transform tool. However, when I did this, all of the parts of the characters were messed up and broken apart as the character walked. 

I am wondering how I can simply resize an armature without messing it up or having to redo the entire bone tool process. 

Thanks!