diff --git a/src/main/java/org/kapelle/multiblock/MultiblockListener.java b/src/main/java/org/kapelle/multiblock/MultiblockListener.java
index c7de236..8e0aca3 100644
--- a/src/main/java/org/kapelle/multiblock/MultiblockListener.java
+++ b/src/main/java/org/kapelle/multiblock/MultiblockListener.java
@@ -11,9 +11,9 @@ import org.bukkit.util.BlockVector;
  * Listens for block placements and checks if it is part of a the multiblock structure.
  */
 public abstract class MultiblockListener implements Listener {
-    private final BlockComponent coreBlock;
-    private final BlockVector coreBlockOffset;
-    private final MultiblockStructure structure;
+    protected final BlockComponent coreBlock;
+    protected final BlockVector coreBlockOffset;
+    protected final MultiblockStructure structure;
 
     public MultiblockListener(JavaPlugin plugin, MultiblockStructure structure, BlockVector coreBlockOffset){
         this.structure = structure;