diff --git a/common/buildcraft/core/utils/PathFinding.java b/common/buildcraft/core/utils/PathFinding.java
index 4a751ae8..e81174bf 100755
--- a/common/buildcraft/core/utils/PathFinding.java
+++ b/common/buildcraft/core/utils/PathFinding.java
@@ -14,6 +14,7 @@ import java.util.HashMap;
 
 import net.minecraft.world.IBlockAccess;
 
+import buildcraft.api.core.BuildCraftAPI;
 import buildcraft.core.BlockIndex;
 
 /**
@@ -90,6 +91,10 @@ public class PathFinding {
 						continue;
 					}
 
+					if (!BuildCraftAPI.isSoftBlock(world, x, y, z)) {
+						continue;
+					}
+
 					BlockIndex index = new BlockIndex(x, y, z);
 
 					Node nextNode = new Node();