Units can walk through high-scaled buildlings?!!

In a map i am making, i made a farm and made it 5 times bigger. A problem with this is that the pathing is still on the puny 1x1 thing, therefore units can still run through it. Is anyone smart enough to know how to fix it? o_O

pathing blockers will solve your problem. They can be found in the doodad category "Pathing Blockers"

What is posted above is a solution, but not a very easy one.

To fix pathing, you must also change the collision size of the building as well as the model scale.