diff --git a/core/src/mindustry/world/blocks/environment/Floor.java b/core/src/mindustry/world/blocks/environment/Floor.java
index c6233c52d6..02aed4b003 100644
--- a/core/src/mindustry/world/blocks/environment/Floor.java
+++ b/core/src/mindustry/world/blocks/environment/Floor.java
@@ -119,7 +119,7 @@ public class Floor extends Block{
         if(wall == null) wall = Blocks.air;
 
         if(decoration == Blocks.air){
-            decoration = content.blocks().min(b -> b instanceof Boulder && b.breakable ? mapColor.diff(b.mapColor) : Float.POSITIVE_INFINITY);
+            decoration = content.blocks().min(b -> b instanceof Boulder && b.minfo.mod == null && b.breakable ? mapColor.diff(b.mapColor) : Float.POSITIVE_INFINITY);
         }
 
         if(isLiquid && walkEffect == Fx.none){