diff --git a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/block/behavior/SpreadingBlockBehavior.java b/bukkit/src/main/java/net/momirealms/craftengine/bukkit/block/behavior/SpreadingBlockBehavior.java
index a503edad3..ca479b755 100644
--- a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/block/behavior/SpreadingBlockBehavior.java
+++ b/bukkit/src/main/java/net/momirealms/craftengine/bukkit/block/behavior/SpreadingBlockBehavior.java
@@ -35,7 +35,7 @@ public class SpreadingBlockBehavior extends BukkitBlockBehavior {
         }
     }
 
-    public static class Factory implements BlockBehaviorFactory {
+    private static class Factory implements BlockBehaviorFactory {
 
         @Override
         public BlockBehavior create(CustomBlock block, Map<String, Object> arguments) {