diff --git a/data/plugins/consumables/potions.rb b/data/plugins/consumables/potions.rb
index 3ec4c8a0..71505929 100644
--- a/data/plugins/consumables/potions.rb
+++ b/data/plugins/consumables/potions.rb
@@ -4,14 +4,21 @@ java_import 'org.apollo.game.model.entity.Skill'
 
 private
 
-DRINK_POTION_SOUND = 334
-EMPTY_VIAL_ID = 229
+module Constants
+
+  # The sound made when drinking a potion.
+  DRINK_POTION_SOUND = 334
+
+  # The id of an empty vial.
+  EMPTY_VIAL_ID = 229
+
+end
 
 # A drinkable potion.
 class Potion < Consumable
 
   def initialize(id, name, doses)
-    super(name, id, DRINK_POTION_SOUND)
+    super(name, id, Constants::DRINK_POTION_SOUND)
     @doses = doses
   end
 
@@ -24,7 +31,7 @@ class Potion < Consumable
       player.send_message("You have #{ @doses.length - index } dose#{ "s" unless index == 3 } of potion left.", true)
     else
       player.send_message('You drink the last of your potion.', true)
-      player.inventory.add(EMPTY_VIAL_ID)
+      player.inventory.add(Constants::EMPTY_VIAL_ID)
     end
 
     drink(player)
diff --git a/data/plugins/skill/herblore/potion.rb b/data/plugins/skill/herblore/potion.rb
index 1603f0a1..b99415be 100644
--- a/data/plugins/skill/herblore/potion.rb
+++ b/data/plugins/skill/herblore/potion.rb
@@ -7,6 +7,8 @@ java_import 'org.apollo.game.model.def.ItemDefinition'
 java_import 'org.apollo.game.model.inter.EnterAmountListener'
 java_import 'org.apollo.game.model.inter.dialogue.DialogueAdapter'
 
+private
+
 WATER_VIAL_ID = 227
 EMPTY_VIAL_ID = 229