diff --git a/core/src/mindustry/entities/comp/BuildingComp.java b/core/src/mindustry/entities/comp/BuildingComp.java
index 00a2d29723..cc5af14398 100644
--- a/core/src/mindustry/entities/comp/BuildingComp.java
+++ b/core/src/mindustry/entities/comp/BuildingComp.java
@@ -272,6 +272,10 @@ abstract class BuildingComp implements Posc, Teamc, Healthc, Buildingc, Timerc,
     //region utility methods
 
     public boolean isDiscovered(Team viewer){
+        if(state.rules.borderDarkness && world.getDarkness(tile.x, tile.y) >= 3){
+            return false;
+        }
+
         if(viewer == null) return true;
         if(block.size <= 2){
             return fogControl.isDiscovered(viewer, tile.x, tile.y);
@@ -1940,6 +1944,8 @@ abstract class BuildingComp implements Posc, Teamc, Healthc, Buildingc, Timerc,
 
         int size = block.size, of = block.sizeOffset, tx = tile.x, ty = tile.y;
 
+        if(!isDiscovered(viewer)) return true;
+
         for(int x = 0; x < size; x++){
             for(int y = 0; y < size; y++){
                 if(fogControl.isVisibleTile(viewer, tx + x + of, ty + y + of)){