Using Bucklers With Two-Handed Weapons

Ok, maybe it was a house rule (and I'm by no means advocating a change to BG) but when we played AD&D back in the day, we played that the only shield you could use while using a Two-Handed Weapon (ex. Two-Handed Sword, or Bow) was a buckler. Our reasoning was it strapped to the arm and was small enough not to impede the use of the weapon

Did anyone else do this? Or were we just crazy?