How do I Use "Has line of sight" TO a solid?

I'm trying to make my map appear with based on what the player sees using the line of sight object, but if I do player has line of sight to object: make visible and that object has the attribute of "solid" it won't trigger and it will stay invisible.

Any ideas?

You could use 2 separate objects, 1 slightly bigger (1 or 2 pixels) that triggers the line of site and a smaller 1 with the solid behavior.