diff --git a/worldguard-bukkit/src/main/java/com/sk89q/worldguard/bukkit/listener/EventAbstractionListener.java b/worldguard-bukkit/src/main/java/com/sk89q/worldguard/bukkit/listener/EventAbstractionListener.java
index a75ec74a..ad6b3639 100644
--- a/worldguard-bukkit/src/main/java/com/sk89q/worldguard/bukkit/listener/EventAbstractionListener.java
+++ b/worldguard-bukkit/src/main/java/com/sk89q/worldguard/bukkit/listener/EventAbstractionListener.java
@@ -1048,6 +1048,12 @@ public void onBlockDispense(BlockDispenseEvent event) {
             Block placed = dispenserBlock.getRelative(dispenser.getFacing());
             Block clicked = placed.getRelative(dispenser.getFacing());
             handleBlockRightClick(event, cause, item, clicked, placed);
+
+            // handle special dispenser behavior
+            if (item != null && Materials.isShulkerBox(item.getType())) {
+                Events.fireToCancel(event, new PlaceBlockEvent(event, cause, placed.getLocation(), item.getType()));
+                return;
+            }
         }
     }
 
diff --git a/worldguard-bukkit/src/main/java/com/sk89q/worldguard/bukkit/util/Materials.java b/worldguard-bukkit/src/main/java/com/sk89q/worldguard/bukkit/util/Materials.java
index 2cd8acad..c2da8c8e 100644
--- a/worldguard-bukkit/src/main/java/com/sk89q/worldguard/bukkit/util/Materials.java
+++ b/worldguard-bukkit/src/main/java/com/sk89q/worldguard/bukkit/util/Materials.java
@@ -52,27 +52,7 @@ public final class Materials {
     private static final Map<Material, Integer> MATERIAL_FLAGS = new EnumMap<>(Material.class);
     private static final Set<PotionEffectType> DAMAGE_EFFECTS = new HashSet<>();
 
-    private static Set<Material> shulkerBoxes = new HashSet<>();
-
     static {
-        shulkerBoxes.add(Material.SHULKER_BOX);
-        shulkerBoxes.add(Material.WHITE_SHULKER_BOX);
-        shulkerBoxes.add(Material.ORANGE_SHULKER_BOX);
-        shulkerBoxes.add(Material.MAGENTA_SHULKER_BOX);
-        shulkerBoxes.add(Material.LIGHT_BLUE_SHULKER_BOX);
-        shulkerBoxes.add(Material.YELLOW_SHULKER_BOX);
-        shulkerBoxes.add(Material.LIME_SHULKER_BOX);
-        shulkerBoxes.add(Material.PINK_SHULKER_BOX);
-        shulkerBoxes.add(Material.GRAY_SHULKER_BOX);
-        shulkerBoxes.add(Material.LIGHT_GRAY_SHULKER_BOX);
-        shulkerBoxes.add(Material.CYAN_SHULKER_BOX);
-        shulkerBoxes.add(Material.PURPLE_SHULKER_BOX);
-        shulkerBoxes.add(Material.BLUE_SHULKER_BOX);
-        shulkerBoxes.add(Material.BROWN_SHULKER_BOX);
-        shulkerBoxes.add(Material.GREEN_SHULKER_BOX);
-        shulkerBoxes.add(Material.RED_SHULKER_BOX);
-        shulkerBoxes.add(Material.BLACK_SHULKER_BOX);
-
         ENTITY_ITEMS.put(EntityType.PAINTING, Material.PAINTING);
         ENTITY_ITEMS.put(EntityType.ARROW, Material.ARROW);
         ENTITY_ITEMS.put(EntityType.SNOWBALL, Material.SNOWBALL);
@@ -747,12 +727,10 @@ public final class Materials {
         MATERIAL_FLAGS.put(Material.WEEPING_VINES_PLANT, 0);
 
 
-        // Fake tags
-        for (Material m : shulkerBoxes) {
-            MATERIAL_FLAGS.put(m, MODIFIED_ON_RIGHT);
-        }
-
         // Generated via tag
+        for (Material shulkerBox : Tag.SHULKER_BOXES.getValues()) {
+            MATERIAL_FLAGS.put(shulkerBox, MODIFIED_ON_RIGHT);
+        }
         for (Material door : Tag.DOORS.getValues()) {
             MATERIAL_FLAGS.put(door, MODIFIED_ON_RIGHT);
         }
@@ -1034,6 +1012,16 @@ public static boolean isBoat(Material material) {
         return Tag.ITEMS_BOATS.isTagged(material);
     }
 
+    /**
+     * Test whether the given material is a Shulker Box.
+     *
+     * @param material the material
+     * @return true if a Shulker Box block
+     */
+    public static boolean isShulkerBox(Material material) {
+        return Tag.SHULKER_BOXES.isTagged(material);
+    }
+
     /**
      * Test whether the given material is an inventory block.
      *
@@ -1052,7 +1040,7 @@ public static boolean isInventoryBlock(Material material) {
                 || material == Material.BARREL
                 || material == Material.BLAST_FURNACE
                 || material == Material.SMOKER
-                || shulkerBoxes.contains(material);
+                || Tag.SHULKER_BOXES.isTagged(material);
     }
 
     public static boolean isSpawnEgg(Material material) {