diff --git a/init.lua b/init.lua
index dc0ae6f..128d63f 100644
--- a/init.lua
+++ b/init.lua
@@ -18,7 +18,7 @@ minetest.register_craft({
 minetest.register_craftitem("claycrafter:glass_of_water", {
 		description = "Glass of Water",
 		inventory_image = "claycrafter_glass_of_water.png",
-		groups = {h2o = 1}, -- How much time to convert 1 compressed dirt to 4 clay
+		groups = {h2o = 1, vessel = 1}, -- How much time to convert 1 compressed dirt to 4 clay
 })
 
 minetest.register_craft({