diff --git a/init_dist/node_modules/@screeps/simplebot/src/building.js b/init_dist/node_modules/@screeps/simplebot/src/building.js
index 1c16919..313ff55 100644
--- a/init_dist/node_modules/@screeps/simplebot/src/building.js
+++ b/init_dist/node_modules/@screeps/simplebot/src/building.js
@@ -4,7 +4,7 @@ function getRandomFreePos(startPos, distance) {
         x = startPos.x + Math.floor(Math.random()*(distance*2+1)) - distance;
         y = startPos.y + Math.floor(Math.random()*(distance*2+1)) - distance;
     }
-    while((x+y)%2 != (startPos.x+startPos.y)%2 || Game.map.getTerrainAt(x,y,startPos.roomName) == 'wall');
+    while((x+y)%2 != (startPos.x+startPos.y)%2 || Game.map.getRoomTerrain(startPos.roomName).get(x,y) == 1); //'1' means wall.
     return new RoomPosition(x,y,startPos.roomName);
 }